7r+21-r=r-7

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


Simplifying
7r + 21 + -1r = r + -7

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

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

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

Solving
21 + 6r = -7 + 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 + 6r + -1r = -7 + r + -1r

Combine like terms: 6r + -1r = 5r
21 + 5r = -7 + r + -1r

Combine like terms: r + -1r = 0
21 + 5r = -7 + 0
21 + 5r = -7

Add '-21' to each side of the equation.
21 + -21 + 5r = -7 + -21

Combine like terms: 21 + -21 = 0
0 + 5r = -7 + -21
5r = -7 + -21

Combine like terms: -7 + -21 = -28
5r = -28

Divide each side by '5'.
r = -5.6

Simplifying
r = -5.6

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