9-(r-7)=4

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Solution for 9-(r-7)=4 equation: 


Simplifying
9 + -1(r + -7) = 4

Reorder the terms:
9 + -1(-7 + r) = 4
9 + (-7 * -1 + r * -1) = 4
9 + (7 + -1r) = 4

Combine like terms: 9 + 7 = 16
16 + -1r = 4

Solving
16 + -1r = 4

Solving for variable 'r'.

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

Add '-16' to each side of the equation.
16 + -16 + -1r = 4 + -16

Combine like terms: 16 + -16 = 0
0 + -1r = 4 + -16
-1r = 4 + -16

Combine like terms: 4 + -16 = -12
-1r = -12

Divide each side by '-1'.
r = 12

Simplifying
r = 12

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