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3r+10=2r-20
We simplify the equation to the form, which is simple to understand
3r+10=2r-20
We move all terms containing r to the left and all other terms to the right.
+3r-2r=-20-10
We simplify left and right side of the equation.
+1r=-30
We divide both sides of the equation by 1 to get r.
r=-30
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