3r-9=-8+4r

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Solution for 3r-9=-8+4r equation:


Simplifying
3r + -9 = -8 + 4r

Reorder the terms:
-9 + 3r = -8 + 4r

Solving
-9 + 3r = -8 + 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.
-9 + 3r + -4r = -8 + 4r + -4r

Combine like terms: 3r + -4r = -1r
-9 + -1r = -8 + 4r + -4r

Combine like terms: 4r + -4r = 0
-9 + -1r = -8 + 0
-9 + -1r = -8

Add '9' to each side of the equation.
-9 + 9 + -1r = -8 + 9

Combine like terms: -9 + 9 = 0
0 + -1r = -8 + 9
-1r = -8 + 9

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

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

Simplifying
r = -1

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