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90.4=8(m+3.9)
We simplify the equation to the form, which is simple to understand
90.4=8(m+3.9)
Reorder the terms in parentheses
90.4=+(+8m+31.2)
Remove unnecessary parentheses
+90.4=+8m+31.2
We move all terms containing m to the left and all other terms to the right.
-8m=+31.2-90.4
We simplify left and right side of the equation.
-8m=-59.2
We divide both sides of the equation by -08 to get m.
m=7.4
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