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2r+4=2r+4
We simplify the equation to the form, which is simple to understand
2r+4=2r+4
We move all terms containing r to the left and all other terms to the right.
+2r-2r=+4-4
We simplify left and right side of the equation.
r=0
0=0
This equation is an identity, so all real numbers are solutions.
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