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x+(0.5x+3)=90
We move all terms to the left:
x+(0.5x+3)-(90)=0
We get rid of parentheses
x+0.5x+3-90=0
We add all the numbers together, and all the variables
1.5x-87=0
We move all terms containing x to the left, all other terms to the right
1.5x=87
x=87/1.5
x=58
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