120=-4(5-7r)

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Solution for 120=-4(5-7r) equation:


Simplifying
120 = -4(5 + -7r)
120 = (5 * -4 + -7r * -4)
120 = (-20 + 28r)

Solving
120 = -20 + 28r

Solving for variable 'r'.

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

Add '-28r' to each side of the equation.
120 + -28r = -20 + 28r + -28r

Combine like terms: 28r + -28r = 0
120 + -28r = -20 + 0
120 + -28r = -20

Add '-120' to each side of the equation.
120 + -120 + -28r = -20 + -120

Combine like terms: 120 + -120 = 0
0 + -28r = -20 + -120
-28r = -20 + -120

Combine like terms: -20 + -120 = -140
-28r = -140

Divide each side by '-28'.
r = 5

Simplifying
r = 5

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