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4(x+35)-3(-x+21)=-21
We move all terms to the left:
4(x+35)-3(-x+21)-(-21)=0
We add all the numbers together, and all the variables
4(x+35)-3(-1x+21)-(-21)=0
We add all the numbers together, and all the variables
4(x+35)-3(-1x+21)+21=0
We multiply parentheses
4x+3x+140-63+21=0
We add all the numbers together, and all the variables
7x+98=0
We move all terms containing x to the left, all other terms to the right
7x=-98
x=-98/7
x=-14
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