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(12x-3)+(25x-2)=180
We move all terms to the left:
(12x-3)+(25x-2)-(180)=0
We get rid of parentheses
12x+25x-3-2-180=0
We add all the numbers together, and all the variables
37x-185=0
We move all terms containing x to the left, all other terms to the right
37x=185
x=185/37
x=5
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