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(12x-2)+(10x-5)=191
We move all terms to the left:
(12x-2)+(10x-5)-(191)=0
We get rid of parentheses
12x+10x-2-5-191=0
We add all the numbers together, and all the variables
22x-198=0
We move all terms containing x to the left, all other terms to the right
22x=198
x=198/22
x=9
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