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4m-5+2m+8=0
We simplify the equation to the form, which is simple to understand
4m-5+2m+8=0
We move all terms containing m to the left and all other terms to the right.
+4m+2m=0+5-8
We simplify left and right side of the equation.
+6m=-3
We divide both sides of the equation by 6 to get m.
m=-0.5
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