123=5(7-8r)-4r

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Solution for 123=5(7-8r)-4r equation:


Simplifying
123 = 5(7 + -8r) + -4r
123 = (7 * 5 + -8r * 5) + -4r
123 = (35 + -40r) + -4r

Combine like terms: -40r + -4r = -44r
123 = 35 + -44r

Solving
123 = 35 + -44r

Solving for variable 'r'.

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

Add '44r' to each side of the equation.
123 + 44r = 35 + -44r + 44r

Combine like terms: -44r + 44r = 0
123 + 44r = 35 + 0
123 + 44r = 35

Add '-123' to each side of the equation.
123 + -123 + 44r = 35 + -123

Combine like terms: 123 + -123 = 0
0 + 44r = 35 + -123
44r = 35 + -123

Combine like terms: 35 + -123 = -88
44r = -88

Divide each side by '44'.
r = -2

Simplifying
r = -2

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