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3.5(x+1)-15=5x-2.8
We move all terms to the left:
3.5(x+1)-15-(5x-2.8)=0
We multiply parentheses
3.5x-(5x-2.8)+3.5-15=0
We get rid of parentheses
3.5x-5x+2.8+3.5-15=0
We add all the numbers together, and all the variables
-1.5x-8.7=0
We move all terms containing x to the left, all other terms to the right
-1.5x=8.7
x=8.7/-1.5
x=-5+1/1.25
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