8.7-4.5m=-3(1.5-2.1)+4.2

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Solution for 8.7-4.5m=-3(1.5-2.1)+4.2 equation: 


Simplifying
8.7 + -4.5m = -3(1.5 + -2.1) + 4.2

Combine like terms: 1.5 + -2.1 = -0.6
8.7 + -4.5m = -3(-0.6) + 4.2

Multiply -3 * -0.6
8.7 + -4.5m = 1.8 + 4.2

Combine like terms: 1.8 + 4.2 = 6
8.7 + -4.5m = 6

Solving
8.7 + -4.5m = 6

Solving for variable 'm'.

Move all terms containing m to the left, all other terms to the right.

Add '-8.7' to each side of the equation.
8.7 + -8.7 + -4.5m = 6 + -8.7

Combine like terms: 8.7 + -8.7 = 0.0
0.0 + -4.5m = 6 + -8.7
-4.5m = 6 + -8.7

Combine like terms: 6 + -8.7 = -2.7
-4.5m = -2.7

Divide each side by '-4.5'.
m = 0.6

Simplifying
m = 0.6

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