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2x+3.5(25-x)=65
We move all terms to the left:
2x+3.5(25-x)-(65)=0
We add all the numbers together, and all the variables
2x+3.5(-1x+25)-65=0
We multiply parentheses
2x-3.5x+87.5-65=0
We add all the numbers together, and all the variables
-1.5x+22.5=0
We move all terms containing x to the left, all other terms to the right
-1.5x=-22.5
x=-22.5/-1.5
x=+15
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