-4r+21=-7(5-4r)-8

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Solution for -4r+21=-7(5-4r)-8 equation:


Simplifying
-4r + 21 = -7(5 + -4r) + -8

Reorder the terms:
21 + -4r = -7(5 + -4r) + -8
21 + -4r = (5 * -7 + -4r * -7) + -8
21 + -4r = (-35 + 28r) + -8

Reorder the terms:
21 + -4r = -35 + -8 + 28r

Combine like terms: -35 + -8 = -43
21 + -4r = -43 + 28r

Solving
21 + -4r = -43 + 28r

Solving for variable 'r'.

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

Add '-28r' to each side of the equation.
21 + -4r + -28r = -43 + 28r + -28r

Combine like terms: -4r + -28r = -32r
21 + -32r = -43 + 28r + -28r

Combine like terms: 28r + -28r = 0
21 + -32r = -43 + 0
21 + -32r = -43

Add '-21' to each side of the equation.
21 + -21 + -32r = -43 + -21

Combine like terms: 21 + -21 = 0
0 + -32r = -43 + -21
-32r = -43 + -21

Combine like terms: -43 + -21 = -64
-32r = -64

Divide each side by '-32'.
r = 2

Simplifying
r = 2

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