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m+15-30+2*m-20=0
We simplify the equation to the form, which is simple to understand
m+15-30+2*m-20=0
We move all terms containing m to the left and all other terms to the right.
+1m+2m=0-15+30+20
We simplify left and right side of the equation.
+3m=+35
We divide both sides of the equation by 3 to get m.
m=11.666666666667
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