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(2x+30)+78=360
We move all terms to the left:
(2x+30)+78-(360)=0
We add all the numbers together, and all the variables
(2x+30)-282=0
We get rid of parentheses
2x+30-282=0
We add all the numbers together, and all the variables
2x-252=0
We move all terms containing x to the left, all other terms to the right
2x=252
x=252/2
x=126
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