-31=5(1-4r)+4(r-1)

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Solution for -31=5(1-4r)+4(r-1) equation:


Simplifying
-31 = 5(1 + -4r) + 4(r + -1)
-31 = (1 * 5 + -4r * 5) + 4(r + -1)
-31 = (5 + -20r) + 4(r + -1)

Reorder the terms:
-31 = 5 + -20r + 4(-1 + r)
-31 = 5 + -20r + (-1 * 4 + r * 4)
-31 = 5 + -20r + (-4 + 4r)

Reorder the terms:
-31 = 5 + -4 + -20r + 4r

Combine like terms: 5 + -4 = 1
-31 = 1 + -20r + 4r

Combine like terms: -20r + 4r = -16r
-31 = 1 + -16r

Solving
-31 = 1 + -16r

Solving for variable 'r'.

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

Add '16r' to each side of the equation.
-31 + 16r = 1 + -16r + 16r

Combine like terms: -16r + 16r = 0
-31 + 16r = 1 + 0
-31 + 16r = 1

Add '31' to each side of the equation.
-31 + 31 + 16r = 1 + 31

Combine like terms: -31 + 31 = 0
0 + 16r = 1 + 31
16r = 1 + 31

Combine like terms: 1 + 31 = 32
16r = 32

Divide each side by '16'.
r = 2

Simplifying
r = 2

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