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2(x+4)-5(10-7x)=3x+8-21
We move all terms to the left:
2(x+4)-5(10-7x)-(3x+8-21)=0
We add all the numbers together, and all the variables
2(x+4)-5(-7x+10)-(3x-13)=0
We multiply parentheses
2x+35x-(3x-13)+8-50=0
We get rid of parentheses
2x+35x-3x+13+8-50=0
We add all the numbers together, and all the variables
34x-29=0
We move all terms containing x to the left, all other terms to the right
34x=29
x=29/34
x=29/34
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