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x+(3x-15)=4
We move all terms to the left:
x+(3x-15)-(4)=0
We get rid of parentheses
x+3x-15-4=0
We add all the numbers together, and all the variables
4x-19=0
We move all terms containing x to the left, all other terms to the right
4x=19
x=19/4
x=4+3/4
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