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5(x+15)+30=120
We move all terms to the left:
5(x+15)+30-(120)=0
We add all the numbers together, and all the variables
5(x+15)-90=0
We multiply parentheses
5x+75-90=0
We add all the numbers together, and all the variables
5x-15=0
We move all terms containing x to the left, all other terms to the right
5x=15
x=15/5
x=3
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