9r+7=42-8

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Solution for 9r+7=42-8 equation: 


Simplifying
9r + 7 = 42 + -8

Reorder the terms:
7 + 9r = 42 + -8

Combine like terms: 42 + -8 = 34
7 + 9r = 34

Solving
7 + 9r = 34

Solving for variable 'r'.

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

Add '-7' to each side of the equation.
7 + -7 + 9r = 34 + -7

Combine like terms: 7 + -7 = 0
0 + 9r = 34 + -7
9r = 34 + -7

Combine like terms: 34 + -7 = 27
9r = 27

Divide each side by '9'.
r = 3

Simplifying
r = 3

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