-10=-2(1-3r)-9r

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Solution for -10=-2(1-3r)-9r equation:


Simplifying
-10 = -2(1 + -3r) + -9r
-10 = (1 * -2 + -3r * -2) + -9r
-10 = (-2 + 6r) + -9r

Combine like terms: 6r + -9r = -3r
-10 = -2 + -3r

Solving
-10 = -2 + -3r

Solving for variable 'r'.

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

Add '3r' to each side of the equation.
-10 + 3r = -2 + -3r + 3r

Combine like terms: -3r + 3r = 0
-10 + 3r = -2 + 0
-10 + 3r = -2

Add '10' to each side of the equation.
-10 + 10 + 3r = -2 + 10

Combine like terms: -10 + 10 = 0
0 + 3r = -2 + 10
3r = -2 + 10

Combine like terms: -2 + 10 = 8
3r = 8

Divide each side by '3'.
r = 2.666666667

Simplifying
r = 2.666666667

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