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145-3.5x=125-3x
We move all terms to the left:
145-3.5x-(125-3x)=0
We add all the numbers together, and all the variables
-3.5x-(-3x+125)+145=0
We get rid of parentheses
-3.5x+3x-125+145=0
We add all the numbers together, and all the variables
-0.5x+20=0
We move all terms containing x to the left, all other terms to the right
-0.5x=-20
x=-20/-0.5
x=+40
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