6r-3(-3r+7)=-126

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Solution for 6r-3(-3r+7)=-126 equation:


Simplifying
6r + -3(-3r + 7) = -126

Reorder the terms:
6r + -3(7 + -3r) = -126
6r + (7 * -3 + -3r * -3) = -126
6r + (-21 + 9r) = -126

Reorder the terms:
-21 + 6r + 9r = -126

Combine like terms: 6r + 9r = 15r
-21 + 15r = -126

Solving
-21 + 15r = -126

Solving for variable 'r'.

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

Add '21' to each side of the equation.
-21 + 21 + 15r = -126 + 21

Combine like terms: -21 + 21 = 0
0 + 15r = -126 + 21
15r = -126 + 21

Combine like terms: -126 + 21 = -105
15r = -105

Divide each side by '15'.
r = -7

Simplifying
r = -7

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