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180-5x+21=12x+6
We move all terms to the left:
180-5x+21-(12x+6)=0
We add all the numbers together, and all the variables
-5x-(12x+6)+201=0
We get rid of parentheses
-5x-12x-6+201=0
We add all the numbers together, and all the variables
-17x+195=0
We move all terms containing x to the left, all other terms to the right
-17x=-195
x=-195/-17
x=11+8/17
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