-3(-5r-7)=-21+8r

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Solution for -3(-5r-7)=-21+8r equation:


Simplifying
-3(-5r + -7) = -21 + 8r

Reorder the terms:
-3(-7 + -5r) = -21 + 8r
(-7 * -3 + -5r * -3) = -21 + 8r
(21 + 15r) = -21 + 8r

Solving
21 + 15r = -21 + 8r

Solving for variable 'r'.

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

Add '-8r' to each side of the equation.
21 + 15r + -8r = -21 + 8r + -8r

Combine like terms: 15r + -8r = 7r
21 + 7r = -21 + 8r + -8r

Combine like terms: 8r + -8r = 0
21 + 7r = -21 + 0
21 + 7r = -21

Add '-21' to each side of the equation.
21 + -21 + 7r = -21 + -21

Combine like terms: 21 + -21 = 0
0 + 7r = -21 + -21
7r = -21 + -21

Combine like terms: -21 + -21 = -42
7r = -42

Divide each side by '7'.
r = -6

Simplifying
r = -6

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