6r-21=-30+7r

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Solution for 6r-21=-30+7r equation:


Simplifying
6r + -21 = -30 + 7r

Reorder the terms:
-21 + 6r = -30 + 7r

Solving
-21 + 6r = -30 + 7r

Solving for variable 'r'.

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

Add '-7r' to each side of the equation.
-21 + 6r + -7r = -30 + 7r + -7r

Combine like terms: 6r + -7r = -1r
-21 + -1r = -30 + 7r + -7r

Combine like terms: 7r + -7r = 0
-21 + -1r = -30 + 0
-21 + -1r = -30

Add '21' to each side of the equation.
-21 + 21 + -1r = -30 + 21

Combine like terms: -21 + 21 = 0
0 + -1r = -30 + 21
-1r = -30 + 21

Combine like terms: -30 + 21 = -9
-1r = -9

Divide each side by '-1'.
r = 9

Simplifying
r = 9

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