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90-(x+3)/4=87
We move all terms to the left:
90-(x+3)/4-(87)=0
We add all the numbers together, and all the variables
-(x+3)/4+3=0
We multiply all the terms by the denominator
-(x+3)+3*4=0
We add all the numbers together, and all the variables
-(x+3)+12=0
We get rid of parentheses
-x-3+12=0
We add all the numbers together, and all the variables
-1x+9=0
We move all terms containing x to the left, all other terms to the right
-x=-9
x=-9/-1
x=+9
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