7(r-2)-8r=-21-r

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Solution for 7(r-2)-8r=-21-r equation: 


Simplifying
7(r + -2) + -8r = -21 + -1r

Reorder the terms:
7(-2 + r) + -8r = -21 + -1r
(-2 * 7 + r * 7) + -8r = -21 + -1r
(-14 + 7r) + -8r = -21 + -1r

Combine like terms: 7r + -8r = -1r
-14 + -1r = -21 + -1r

Add 'r' to each side of the equation.
-14 + -1r + r = -21 + -1r + r

Combine like terms: -1r + r = 0
-14 + 0 = -21 + -1r + r
-14 = -21 + -1r + r

Combine like terms: -1r + r = 0
-14 = -21 + 0
-14 = -21

Solving
-14 = -21

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.

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