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4+(7x+4)=15
We move all terms to the left:
4+(7x+4)-(15)=0
We add all the numbers together, and all the variables
(7x+4)-11=0
We get rid of parentheses
7x+4-11=0
We add all the numbers together, and all the variables
7x-7=0
We move all terms containing x to the left, all other terms to the right
7x=7
x=7/7
x=1
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