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Sagot :
Since 5x contains the variable to solve for move it to the left-hand side of the equation by subtracting 5x from both sides.
3x+7−5x=−21
Add 3x and −5x to get −2x.
−2x+7=−21
Since 7 does not have the variable to solve for, move it to the right hand side of the equation by subtracting 7 from both sides.
−2x=−7−21
Subtract 21 from −7 to get −28.
−2x=−28
Divide each term in the equation by −2.
x=14
Answer:
x=14
3x+7−5x=−21
Add 3x and −5x to get −2x.
−2x+7=−21
Since 7 does not have the variable to solve for, move it to the right hand side of the equation by subtracting 7 from both sides.
−2x=−7−21
Subtract 21 from −7 to get −28.
−2x=−28
Divide each term in the equation by −2.
x=14
Answer:
x=14
so try to get the x term to one side by itself
add 21 to both siede
3x+28=5x
subtract 3 x from both sides
28=2x
divide 2
14=x
add 21 to both siede
3x+28=5x
subtract 3 x from both sides
28=2x
divide 2
14=x
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