9=8-(-1)+4r

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Solution for 9=8-(-1)+4r equation:


Simplifying
9 = 8 + -1(-1) + 4r

Multiply -1 * -1
9 = 8 + 1 + 4r

Combine like terms: 8 + 1 = 9
9 = 9 + 4r

Add '-9' to each side of the equation.
9 + -9 = 9 + -9 + 4r

Combine like terms: 9 + -9 = 0
0 = 9 + -9 + 4r

Combine like terms: 9 + -9 = 0
0 = 0 + 4r
0 = 4r

Solving
0 = 4r

Solving for variable 'r'.

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

Add '-4r' to each side of the equation.
0 + -4r = 4r + -4r
Remove the zero:
-4r = 4r + -4r

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

Divide each side by '-4'.
r = 0

Simplifying
r = 0

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