20=-10(4+m)

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Solution for 20=-10(4+m) equation:


Simplifying
20 = -10(4 + m)
20 = (4 * -10 + m * -10)
20 = (-40 + -10m)

Solving
20 = -40 + -10m

Solving for variable 'm'.

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

Add '10m' to each side of the equation.
20 + 10m = -40 + -10m + 10m

Combine like terms: -10m + 10m = 0
20 + 10m = -40 + 0
20 + 10m = -40

Add '-20' to each side of the equation.
20 + -20 + 10m = -40 + -20

Combine like terms: 20 + -20 = 0
0 + 10m = -40 + -20
10m = -40 + -20

Combine like terms: -40 + -20 = -60
10m = -60

Divide each side by '10'.
m = -6

Simplifying
m = -6

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