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76=15x+31
We move all terms to the left:
76-(15x+31)=0
We get rid of parentheses
-15x-31+76=0
We add all the numbers together, and all the variables
-15x+45=0
We move all terms containing x to the left, all other terms to the right
-15x=-45
x=-45/-15
x=+3
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