-21=-6+r

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Solution for -21=-6+r equation: 


Simplifying
-21 = -6 + r

Solving
-21 = -6 + r

Solving for variable 'r'.

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

Add '-1r' to each side of the equation.
-21 + -1r = -6 + r + -1r

Combine like terms: r + -1r = 0
-21 + -1r = -6 + 0
-21 + -1r = -6

Add '21' to each side of the equation.
-21 + 21 + -1r = -6 + 21

Combine like terms: -21 + 21 = 0
0 + -1r = -6 + 21
-1r = -6 + 21

Combine like terms: -6 + 21 = 15
-1r = 15

Divide each side by '-1'.
r = -15

Simplifying
r = -15

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