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5x+(2x-30)=180
We move all terms to the left:
5x+(2x-30)-(180)=0
We get rid of parentheses
5x+2x-30-180=0
We add all the numbers together, and all the variables
7x-210=0
We move all terms containing x to the left, all other terms to the right
7x=210
x=210/7
x=30
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