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18x+19=x+87
We move all terms to the left:
18x+19-(x+87)=0
We get rid of parentheses
18x-x-87+19=0
We add all the numbers together, and all the variables
17x-68=0
We move all terms containing x to the left, all other terms to the right
17x=68
x=68/17
x=4
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