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2q+90+42=180
We simplify the equation to the form, which is simple to understand
2q+90+42=180
We move all terms containing q to the left and all other terms to the right.
+2q=+180-90-42
We simplify left and right side of the equation.
+2q=+48
We divide both sides of the equation by 2 to get q.
q=24
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