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6x+15x-12+19x+12=180
We move all terms to the left:
6x+15x-12+19x+12-(180)=0
We add all the numbers together, and all the variables
40x-180=0
We move all terms containing x to the left, all other terms to the right
40x=180
x=180/40
x=4+1/2
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