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(10x-3)+(15x+12)+30=180
We move all terms to the left:
(10x-3)+(15x+12)+30-(180)=0
We add all the numbers together, and all the variables
(10x-3)+(15x+12)-150=0
We get rid of parentheses
10x+15x-3+12-150=0
We add all the numbers together, and all the variables
25x-141=0
We move all terms containing x to the left, all other terms to the right
25x=141
x=141/25
x=5+16/25
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