7r+4=8r-4

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


Simplifying
7r + 4 = 8r + -4

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

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

Solving
4 + 7r = -4 + 8r

Solving for variable 'r'.

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

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

Combine like terms: 7r + -8r = -1r
4 + -1r = -4 + 8r + -8r

Combine like terms: 8r + -8r = 0
4 + -1r = -4 + 0
4 + -1r = -4

Add '-4' to each side of the equation.
4 + -4 + -1r = -4 + -4

Combine like terms: 4 + -4 = 0
0 + -1r = -4 + -4
-1r = -4 + -4

Combine like terms: -4 + -4 = -8
-1r = -8

Divide each side by '-1'.
r = 8

Simplifying
r = 8

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