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18x-78=5x+3
We move all terms to the left:
18x-78-(5x+3)=0
We get rid of parentheses
18x-5x-3-78=0
We add all the numbers together, and all the variables
13x-81=0
We move all terms containing x to the left, all other terms to the right
13x=81
x=81/13
x=6+3/13
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