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5x+(3x+30)=180
We move all terms to the left:
5x+(3x+30)-(180)=0
We get rid of parentheses
5x+3x+30-180=0
We add all the numbers together, and all the variables
8x-150=0
We move all terms containing x to the left, all other terms to the right
8x=150
x=150/8
x=18+3/4
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