31=-4(5r+7)

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Solution for 31=-4(5r+7) equation:


Simplifying
31 = -4(5r + 7)

Reorder the terms:
31 = -4(7 + 5r)
31 = (7 * -4 + 5r * -4)
31 = (-28 + -20r)

Solving
31 = -28 + -20r

Solving for variable 'r'.

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

Add '20r' to each side of the equation.
31 + 20r = -28 + -20r + 20r

Combine like terms: -20r + 20r = 0
31 + 20r = -28 + 0
31 + 20r = -28

Add '-31' to each side of the equation.
31 + -31 + 20r = -28 + -31

Combine like terms: 31 + -31 = 0
0 + 20r = -28 + -31
20r = -28 + -31

Combine like terms: -28 + -31 = -59
20r = -59

Divide each side by '20'.
r = -2.95

Simplifying
r = -2.95

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