8r+9+7r+6=90

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Solution for 8r+9+7r+6=90 equation:


Simplifying
8r + 9 + 7r + 6 = 90

Reorder the terms:
9 + 6 + 8r + 7r = 90

Combine like terms: 9 + 6 = 15
15 + 8r + 7r = 90

Combine like terms: 8r + 7r = 15r
15 + 15r = 90

Solving
15 + 15r = 90

Solving for variable 'r'.

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

Add '-15' to each side of the equation.
15 + -15 + 15r = 90 + -15

Combine like terms: 15 + -15 = 0
0 + 15r = 90 + -15
15r = 90 + -15

Combine like terms: 90 + -15 = 75
15r = 75

Divide each side by '15'.
r = 5

Simplifying
r = 5

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