9+4r=2r-9

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Solution for 9+4r=2r-9 equation:


Simplifying
9 + 4r = 2r + -9

Reorder the terms:
9 + 4r = -9 + 2r

Solving
9 + 4r = -9 + 2r

Solving for variable 'r'.

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

Add '-2r' to each side of the equation.
9 + 4r + -2r = -9 + 2r + -2r

Combine like terms: 4r + -2r = 2r
9 + 2r = -9 + 2r + -2r

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

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

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

Combine like terms: -9 + -9 = -18
2r = -18

Divide each side by '2'.
r = -9

Simplifying
r = -9

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