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90-7.29x=68.13
We move all terms to the left:
90-7.29x-(68.13)=0
We add all the numbers together, and all the variables
-7.29x+21.87=0
We move all terms containing x to the left, all other terms to the right
-7.29x=-21.87
x=-21.87/-7.29
x=+3
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