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15-7x=-5-2x
We move all terms to the left:
15-7x-(-5-2x)=0
We add all the numbers together, and all the variables
-7x-(-2x-5)+15=0
We get rid of parentheses
-7x+2x+5+15=0
We add all the numbers together, and all the variables
-5x+20=0
We move all terms containing x to the left, all other terms to the right
-5x=-20
x=-20/-5
x=+4
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