r-4=8+7r

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Solution for r-4=8+7r equation:


Simplifying
r + -4 = 8 + 7r

Reorder the terms:
-4 + r = 8 + 7r

Solving
-4 + r = 8 + 7r

Solving for variable 'r'.

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

Add '-7r' to each side of the equation.
-4 + r + -7r = 8 + 7r + -7r

Combine like terms: r + -7r = -6r
-4 + -6r = 8 + 7r + -7r

Combine like terms: 7r + -7r = 0
-4 + -6r = 8 + 0
-4 + -6r = 8

Add '4' to each side of the equation.
-4 + 4 + -6r = 8 + 4

Combine like terms: -4 + 4 = 0
0 + -6r = 8 + 4
-6r = 8 + 4

Combine like terms: 8 + 4 = 12
-6r = 12

Divide each side by '-6'.
r = -2

Simplifying
r = -2

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