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87=4x-9
We move all terms to the left:
87-(4x-9)=0
We get rid of parentheses
-4x+9+87=0
We add all the numbers together, and all the variables
-4x+96=0
We move all terms containing x to the left, all other terms to the right
-4x=-96
x=-96/-4
x=+24
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