54+8r+7r=21

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Solution for 54+8r+7r=21 equation: 


Simplifying
54 + 8r + 7r = 21

Combine like terms: 8r + 7r = 15r
54 + 15r = 21

Solving
54 + 15r = 21

Solving for variable 'r'.

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

Add '-54' to each side of the equation.
54 + -54 + 15r = 21 + -54

Combine like terms: 54 + -54 = 0
0 + 15r = 21 + -54
15r = 21 + -54

Combine like terms: 21 + -54 = -33
15r = -33

Divide each side by '15'.
r = -2.2

Simplifying
r = -2.2

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