r-9-(r+6)=4

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Solution for r-9-(r+6)=4 equation: 


Simplifying
r + -9 + -1(r + 6) = 4

Reorder the terms:
r + -9 + -1(6 + r) = 4
r + -9 + (6 * -1 + r * -1) = 4
r + -9 + (-6 + -1r) = 4

Reorder the terms:
-9 + -6 + r + -1r = 4

Combine like terms: -9 + -6 = -15
-15 + r + -1r = 4

Combine like terms: r + -1r = 0
-15 + 0 = 4
-15 = 4

Solving
-15 = 4

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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