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25=3x+4x=
We move all terms to the left:
25-(3x+4x)=0
We add all the numbers together, and all the variables
-(+7x)+25=0
We get rid of parentheses
-7x+25=0
We move all terms containing x to the left, all other terms to the right
-7x=-25
x=-25/-7
x=3+4/7
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