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0.9x+8.7=15.9
We simplify the equation to the form, which is simple to understand
0.9x+8.7=15.9
We move all terms containing x to the left and all other terms to the right.
+ 0.9x=+15.9-8.7
We simplify left and right side of the equation.
+ 0.9x=+7.2
We divide both sides of the equation by 0.9 to get x.
x=8
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