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90+5x+7+9x-1=180
We simplify the equation to the form, which is simple to understand
90+5x+7+9x-1=180
We move all terms containing x to the left and all other terms to the right.
+5x+9x=+180-90-7+1
We simplify left and right side of the equation.
+14x=+84
We divide both sides of the equation by 14 to get x.
x=6
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