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3.5+3.5(x+10)=357
We move all terms to the left:
3.5+3.5(x+10)-(357)=0
We add all the numbers together, and all the variables
3.5(x+10)-353.5=0
We multiply parentheses
3.5x+35-353.5=0
We add all the numbers together, and all the variables
3.5x-318.5=0
We move all terms containing x to the left, all other terms to the right
3.5x=318.5
x=318.5/3.5
x=91
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