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x=5(90-x)-6
We move all terms to the left:
x-(5(90-x)-6)=0
We add all the numbers together, and all the variables
x-(5(-1x+90)-6)=0
We calculate terms in parentheses: -(5(-1x+90)-6), so:We get rid of parentheses
5(-1x+90)-6
We multiply parentheses
-5x+450-6
We add all the numbers together, and all the variables
-5x+444
Back to the equation:
-(-5x+444)
x+5x-444=0
We add all the numbers together, and all the variables
6x-444=0
We move all terms containing x to the left, all other terms to the right
6x=444
x=444/6
x=74
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