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-189+12x=51+4x
We move all terms to the left:
-189+12x-(51+4x)=0
We add all the numbers together, and all the variables
12x-(4x+51)-189=0
We get rid of parentheses
12x-4x-51-189=0
We add all the numbers together, and all the variables
8x-240=0
We move all terms containing x to the left, all other terms to the right
8x=240
x=240/8
x=30
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