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5x-21+2(4x+3)=180
We move all terms to the left:
5x-21+2(4x+3)-(180)=0
We add all the numbers together, and all the variables
5x+2(4x+3)-201=0
We multiply parentheses
5x+8x+6-201=0
We add all the numbers together, and all the variables
13x-195=0
We move all terms containing x to the left, all other terms to the right
13x=195
x=195/13
x=15
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