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25+40x=55+30x
We move all terms to the left:
25+40x-(55+30x)=0
We add all the numbers together, and all the variables
40x-(30x+55)+25=0
We get rid of parentheses
40x-30x-55+25=0
We add all the numbers together, and all the variables
10x-30=0
We move all terms containing x to the left, all other terms to the right
10x=30
x=30/10
x=3
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