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Sagot :
[tex]\begin{gathered} 8n-12=-12n+8\rightarrow8n+12n=12+8\rightarrow20n=20\rightarrow n=\frac{20}{20} \\ \rightarrow n=1 \end{gathered}[/tex][tex]\begin{gathered} 7y+8=-2y-64\rightarrow7y+2y=-64-8\rightarrow9y=-72\rightarrow y=-\frac{72}{9} \\ \rightarrow y=-8 \end{gathered}[/tex][tex]\begin{gathered} 1+3x=7x-7\rightarrow1+7=7x-3x\rightarrow8=4x\rightarrow\frac{8}{4}=x \\ x=2 \end{gathered}[/tex][tex]\begin{gathered} 6a-3=4+7a\rightarrow-3-4=7a-6a\rightarrow-7=a \\ \rightarrow a=-7 \end{gathered}[/tex][tex]\begin{gathered} 3b-1=14+2b\rightarrow3b-2b=14+1\rightarrow b=15 \\ \rightarrow b=15 \end{gathered}[/tex][tex]\begin{gathered} 12c+18=4+5c\rightarrow12c-5c=4-18\rightarrow7c=-14\rightarrow c=-\frac{14}{7} \\ \rightarrow c=-2 \end{gathered}[/tex][tex]\begin{gathered} 9y+3=5y-13\rightarrow9y-5y=-13-3\rightarrow4y=-16\rightarrow y=-\frac{16}{4} \\ \rightarrow y=-4 \end{gathered}[/tex][tex]\begin{gathered} 3n-2=5n+12\rightarrow-2-12=5n-3n\rightarrow-14=2n\rightarrow-\frac{14}{2}=n \\ \rightarrow n=-7 \end{gathered}[/tex]
Using the distributive property,
[tex]5(m-2)\rightarrow5m-10[/tex]Using the distributive property,
[tex]-2(-3a-4)\rightarrow6a+8[/tex]
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