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129=5x+40
We move all terms to the left:
129-(5x+40)=0
We get rid of parentheses
-5x-40+129=0
We add all the numbers together, and all the variables
-5x+89=0
We move all terms containing x to the left, all other terms to the right
-5x=-89
x=-89/-5
x=17+4/5
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