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25+3x=4x-20
We move all terms to the left:
25+3x-(4x-20)=0
We get rid of parentheses
3x-4x+20+25=0
We add all the numbers together, and all the variables
-1x+45=0
We move all terms containing x to the left, all other terms to the right
-x=-45
x=-45/-1
x=+45
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