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4x+35+7x-4=15x-21
We move all terms to the left:
4x+35+7x-4-(15x-21)=0
We add all the numbers together, and all the variables
11x-(15x-21)+31=0
We get rid of parentheses
11x-15x+21+31=0
We add all the numbers together, and all the variables
-4x+52=0
We move all terms containing x to the left, all other terms to the right
-4x=-52
x=-52/-4
x=+13
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