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2r+20=2(2r-30)
We simplify the equation to the form, which is simple to understand
2r+20=2(2r-30)
Reorder the terms in parentheses
2r+20=+(+4r-60)
Remove unnecessary parentheses
+2r+20=+4r-60
We move all terms containing r to the left and all other terms to the right.
+2r-4r=-60-20
We simplify left and right side of the equation.
-2r=-80
We divide both sides of the equation by -2 to get r.
r=40
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