9-r=r-7

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Solution for 9-r=r-7 equation:


Simplifying
9 + -1r = r + -7

Reorder the terms:
9 + -1r = -7 + r

Solving
9 + -1r = -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.
9 + -1r + -1r = -7 + r + -1r

Combine like terms: -1r + -1r = -2r
9 + -2r = -7 + r + -1r

Combine like terms: r + -1r = 0
9 + -2r = -7 + 0
9 + -2r = -7

Add '-9' to each side of the equation.
9 + -9 + -2r = -7 + -9

Combine like terms: 9 + -9 = 0
0 + -2r = -7 + -9
-2r = -7 + -9

Combine like terms: -7 + -9 = -16
-2r = -16

Divide each side by '-2'.
r = 8

Simplifying
r = 8

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