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12x+5=4x+15
We move all terms to the left:
12x+5-(4x+15)=0
We get rid of parentheses
12x-4x-15+5=0
We add all the numbers together, and all the variables
8x-10=0
We move all terms containing x to the left, all other terms to the right
8x=10
x=10/8
x=1+1/4
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