-21+6r=-3(4r+1)

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Solution for -21+6r=-3(4r+1) equation:


Simplifying
-21 + 6r = -3(4r + 1)

Reorder the terms:
-21 + 6r = -3(1 + 4r)
-21 + 6r = (1 * -3 + 4r * -3)
-21 + 6r = (-3 + -12r)

Solving
-21 + 6r = -3 + -12r

Solving for variable 'r'.

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

Add '12r' to each side of the equation.
-21 + 6r + 12r = -3 + -12r + 12r

Combine like terms: 6r + 12r = 18r
-21 + 18r = -3 + -12r + 12r

Combine like terms: -12r + 12r = 0
-21 + 18r = -3 + 0
-21 + 18r = -3

Add '21' to each side of the equation.
-21 + 21 + 18r = -3 + 21

Combine like terms: -21 + 21 = 0
0 + 18r = -3 + 21
18r = -3 + 21

Combine like terms: -3 + 21 = 18
18r = 18

Divide each side by '18'.
r = 1

Simplifying
r = 1

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