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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+138=0
We move all terms containing x to the left, all other terms to the right
8x=-138
x=-138/8
x=-17+1/4
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