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74x-89=90x-137
We move all terms to the left:
74x-89-(90x-137)=0
We get rid of parentheses
74x-90x+137-89=0
We add all the numbers together, and all the variables
-16x+48=0
We move all terms containing x to the left, all other terms to the right
-16x=-48
x=-48/-16
x=+3
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