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5x+45+90=180
We simplify the equation to the form, which is simple to understand
5x+45+90=180
We move all terms containing x to the left and all other terms to the right.
+5x=+180-45-90
We simplify left and right side of the equation.
+5x=+45
We divide both sides of the equation by 5 to get x.
x=9
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