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4(x+35)-3(-x+21)=35
We move all terms to the left:
4(x+35)-3(-x+21)-(35)=0
We add all the numbers together, and all the variables
4(x+35)-3(-1x+21)-35=0
We multiply parentheses
4x+3x+140-63-35=0
We add all the numbers together, and all the variables
7x+42=0
We move all terms containing x to the left, all other terms to the right
7x=-42
x=-42/7
x=-6
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