1+7r-8=-21

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Solution for 1+7r-8=-21 equation: 


Simplifying
1 + 7r + -8 = -21

Reorder the terms:
1 + -8 + 7r = -21

Combine like terms: 1 + -8 = -7
-7 + 7r = -21

Solving
-7 + 7r = -21

Solving for variable 'r'.

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

Add '7' to each side of the equation.
-7 + 7 + 7r = -21 + 7

Combine like terms: -7 + 7 = 0
0 + 7r = -21 + 7
7r = -21 + 7

Combine like terms: -21 + 7 = -14
7r = -14

Divide each side by '7'.
r = -2

Simplifying
r = -2

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