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25=15-3x
We move all terms to the left:
25-(15-3x)=0
We add all the numbers together, and all the variables
-(-3x+15)+25=0
We get rid of parentheses
3x-15+25=0
We add all the numbers together, and all the variables
3x+10=0
We move all terms containing x to the left, all other terms to the right
3x=-10
x=-10/3
x=-3+1/3
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