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20(4x-3)+15x+12(4x+3)=1155
We move all terms to the left:
20(4x-3)+15x+12(4x+3)-(1155)=0
We add all the numbers together, and all the variables
15x+20(4x-3)+12(4x+3)-1155=0
We multiply parentheses
15x+80x+48x-60+36-1155=0
We add all the numbers together, and all the variables
143x-1179=0
We move all terms containing x to the left, all other terms to the right
143x=1179
x=1179/143
x=8+35/143
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