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15+11x-15+18x=28x+4
We move all terms to the left:
15+11x-15+18x-(28x+4)=0
We add all the numbers together, and all the variables
29x-(28x+4)=0
We get rid of parentheses
29x-28x-4=0
We add all the numbers together, and all the variables
x-4=0
We move all terms containing x to the left, all other terms to the right
x=4
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