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x=6(90-x)-43
We move all terms to the left:
x-(6(90-x)-43)=0
We add all the numbers together, and all the variables
x-(6(-1x+90)-43)=0
We calculate terms in parentheses: -(6(-1x+90)-43), so:We get rid of parentheses
6(-1x+90)-43
We multiply parentheses
-6x+540-43
We add all the numbers together, and all the variables
-6x+497
Back to the equation:
-(-6x+497)
x+6x-497=0
We add all the numbers together, and all the variables
7x-497=0
We move all terms containing x to the left, all other terms to the right
7x=497
x=497/7
x=71
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