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x+(3x=10)=90
We move all terms to the left:
x+(3x-(10))=0
We get rid of parentheses
x+3x-10=0
We add all the numbers together, and all the variables
4x-10=0
We move all terms containing x to the left, all other terms to the right
4x=10
x=10/4
x=2+1/2
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