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8x-7+7x=90
We simplify the equation to the form, which is simple to understand
8x-7+7x=90
We move all terms containing x to the left and all other terms to the right.
+8x+7x=+90+7
We simplify left and right side of the equation.
+15x=+97
We divide both sides of the equation by 15 to get x.
x=6.46666666667
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