-21+6r=3(7r+4)-4r

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Solution for -21+6r=3(7r+4)-4r equation:


Simplifying
-21 + 6r = 3(7r + 4) + -4r

Reorder the terms:
-21 + 6r = 3(4 + 7r) + -4r
-21 + 6r = (4 * 3 + 7r * 3) + -4r
-21 + 6r = (12 + 21r) + -4r

Combine like terms: 21r + -4r = 17r
-21 + 6r = 12 + 17r

Solving
-21 + 6r = 12 + 17r

Solving for variable 'r'.

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

Add '-17r' to each side of the equation.
-21 + 6r + -17r = 12 + 17r + -17r

Combine like terms: 6r + -17r = -11r
-21 + -11r = 12 + 17r + -17r

Combine like terms: 17r + -17r = 0
-21 + -11r = 12 + 0
-21 + -11r = 12

Add '21' to each side of the equation.
-21 + 21 + -11r = 12 + 21

Combine like terms: -21 + 21 = 0
0 + -11r = 12 + 21
-11r = 12 + 21

Combine like terms: 12 + 21 = 33
-11r = 33

Divide each side by '-11'.
r = -3

Simplifying
r = -3

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