-81=4(8+7r)-1

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Solution for -81=4(8+7r)-1 equation:


Simplifying
-81 = 4(8 + 7r) + -1
-81 = (8 * 4 + 7r * 4) + -1
-81 = (32 + 28r) + -1

Reorder the terms:
-81 = 32 + -1 + 28r

Combine like terms: 32 + -1 = 31
-81 = 31 + 28r

Solving
-81 = 31 + 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.
-81 + -28r = 31 + 28r + -28r

Combine like terms: 28r + -28r = 0
-81 + -28r = 31 + 0
-81 + -28r = 31

Add '81' to each side of the equation.
-81 + 81 + -28r = 31 + 81

Combine like terms: -81 + 81 = 0
0 + -28r = 31 + 81
-28r = 31 + 81

Combine like terms: 31 + 81 = 112
-28r = 112

Divide each side by '-28'.
r = -4

Simplifying
r = -4

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