81=7x+3x-9

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Solution for 81=7x+3x-9 equation:


81=7x+3x-9

We simplify the equation to the form, which is simple to understand 
81=7x+3x-9

We move all terms containing x to the left and all other terms to the right. 
-7x-3x=-9-81

We simplify left and right side of the equation. 
-10x=-90

We divide both sides of the equation by -10 to get x. 
x=9

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