21=-5+4(r-3)

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


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

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

Combine like terms: -5 + -12 = -17
21 = -17 + 4r

Solving
21 = -17 + 4r

Solving for variable 'r'.

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

Add '-4r' to each side of the equation.
21 + -4r = -17 + 4r + -4r

Combine like terms: 4r + -4r = 0
21 + -4r = -17 + 0
21 + -4r = -17

Add '-21' to each side of the equation.
21 + -21 + -4r = -17 + -21

Combine like terms: 21 + -21 = 0
0 + -4r = -17 + -21
-4r = -17 + -21

Combine like terms: -17 + -21 = -38
-4r = -38

Divide each side by '-4'.
r = 9.5

Simplifying
r = 9.5

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