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90+2x+5x-1=180
We simplify the equation to the form, which is simple to understand
90+2x+5x-1=180
We move all terms containing x to the left and all other terms to the right.
+2x+5x=+180-90+1
We simplify left and right side of the equation.
+7x=+91
We divide both sides of the equation by 7 to get x.
x=13
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