15=4r+3-8

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Solution for 15=4r+3-8 equation:


Simplifying
15 = 4r + 3 + -8

Reorder the terms:
15 = 3 + -8 + 4r

Combine like terms: 3 + -8 = -5
15 = -5 + 4r

Solving
15 = -5 + 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.
15 + -4r = -5 + 4r + -4r

Combine like terms: 4r + -4r = 0
15 + -4r = -5 + 0
15 + -4r = -5

Add '-15' to each side of the equation.
15 + -15 + -4r = -5 + -15

Combine like terms: 15 + -15 = 0
0 + -4r = -5 + -15
-4r = -5 + -15

Combine like terms: -5 + -15 = -20
-4r = -20

Divide each side by '-4'.
r = 5

Simplifying
r = 5

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