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5x+30+2x=180-5x+30
We move all terms to the left:
5x+30+2x-(180-5x+30)=0
We add all the numbers together, and all the variables
5x+2x-(-5x+210)+30=0
We add all the numbers together, and all the variables
7x-(-5x+210)+30=0
We get rid of parentheses
7x+5x-210+30=0
We add all the numbers together, and all the variables
12x-180=0
We move all terms containing x to the left, all other terms to the right
12x=180
x=180/12
x=15
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