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-1=x-90/12
We move all terms to the left:
-1-(x-90/12)=0
We add all the numbers together, and all the variables
-(+x-90/12)-1=0
We get rid of parentheses
-x-1+90/12=0
We multiply all the terms by the denominator
-x*12+90-1*12=0
We add all the numbers together, and all the variables
-x*12+78=0
Wy multiply elements
-12x+78=0
We move all terms containing x to the left, all other terms to the right
-12x=-78
x=-78/-12
x=6+1/2
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