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8x+5x+3=15x+7
We move all terms to the left:
8x+5x+3-(15x+7)=0
We add all the numbers together, and all the variables
13x-(15x+7)+3=0
We get rid of parentheses
13x-15x-7+3=0
We add all the numbers together, and all the variables
-2x-4=0
We move all terms containing x to the left, all other terms to the right
-2x=4
x=4/-2
x=-2
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