3r+8r=r-7+8r-7

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Solution for 3r+8r=r-7+8r-7 equation:


Simplifying
3r + 8r = r + -7 + 8r + -7

Combine like terms: 3r + 8r = 11r
11r = r + -7 + 8r + -7

Reorder the terms:
11r = -7 + -7 + r + 8r

Combine like terms: -7 + -7 = -14
11r = -14 + r + 8r

Combine like terms: r + 8r = 9r
11r = -14 + 9r

Solving
11r = -14 + 9r

Solving for variable 'r'.

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

Add '-9r' to each side of the equation.
11r + -9r = -14 + 9r + -9r

Combine like terms: 11r + -9r = 2r
2r = -14 + 9r + -9r

Combine like terms: 9r + -9r = 0
2r = -14 + 0
2r = -14

Divide each side by '2'.
r = -7

Simplifying
r = -7

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