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13.8=-9.4r+3.7(2r+4)
We simplify the equation to the form, which is simple to understand
13.8=-9.4r+3.7(2r+4)
Reorder the terms in parentheses
13.8=-9.4r+(+7.4r+14.8)
Remove unnecessary parentheses
+13.8=-9.4r+7.4r+14.8
We move all terms containing r to the left and all other terms to the right.
+9.4r-7.4r=+14.8-13.8
We simplify left and right side of the equation.
+2r=+1
We divide both sides of the equation by 2 to get r.
r=0.5
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