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100+7x=25-18x
We move all terms to the left:
100+7x-(25-18x)=0
We add all the numbers together, and all the variables
7x-(-18x+25)+100=0
We get rid of parentheses
7x+18x-25+100=0
We add all the numbers together, and all the variables
25x+75=0
We move all terms containing x to the left, all other terms to the right
25x=-75
x=-75/25
x=-3
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