-3r+3(4r-5)=21

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Solution for -3r+3(4r-5)=21 equation: 


Simplifying
-3r + 3(4r + -5) = 21

Reorder the terms:
-3r + 3(-5 + 4r) = 21
-3r + (-5 * 3 + 4r * 3) = 21
-3r + (-15 + 12r) = 21

Reorder the terms:
-15 + -3r + 12r = 21

Combine like terms: -3r + 12r = 9r
-15 + 9r = 21

Solving
-15 + 9r = 21

Solving for variable 'r'.

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

Add '15' to each side of the equation.
-15 + 15 + 9r = 21 + 15

Combine like terms: -15 + 15 = 0
0 + 9r = 21 + 15
9r = 21 + 15

Combine like terms: 21 + 15 = 36
9r = 36

Divide each side by '9'.
r = 4

Simplifying
r = 4

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