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Sagot :
[tex]2n-15=5-2n[/tex]
[tex]4n=20[/tex]
[tex]\frac{4n}{4}=\frac{20}{4}[/tex]
[tex]n=5[/tex]
The number is 5
[tex]4n=20[/tex]
[tex]\frac{4n}{4}=\frac{20}{4}[/tex]
[tex]n=5[/tex]
The number is 5
x --- first number
y --- second number
x + y = 2x - 15
x - y = 2y - 5
x - 2x + y = -15
x - y - 2y = - 5
-x + y = -15
x - 3y = - 5
-----------------
-2y = -20 /:(-2)
y = 10
x - 3y = - 5 ⇒ x = - 5 + 3y = - 5 + 3 · 10 = - 5 + 30 = 25
Ans.:
x = 25
y = 10
y --- second number
x + y = 2x - 15
x - y = 2y - 5
x - 2x + y = -15
x - y - 2y = - 5
-x + y = -15
x - 3y = - 5
-----------------
-2y = -20 /:(-2)
y = 10
x - 3y = - 5 ⇒ x = - 5 + 3y = - 5 + 3 · 10 = - 5 + 30 = 25
Ans.:
x = 25
y = 10
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