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3.5(x+2)=x-4
We move all terms to the left:
3.5(x+2)-(x-4)=0
We multiply parentheses
3.5x-(x-4)+7=0
We get rid of parentheses
3.5x-x+4+7=0
We add all the numbers together, and all the variables
2.5x+11=0
We move all terms containing x to the left, all other terms to the right
2.5x=-11
x=-11/2.5
x=-4+1/2.5
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