3r+9(r-2)=7

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Solution for 3r+9(r-2)=7 equation:


Simplifying
3r + 9(r + -2) = 7

Reorder the terms:
3r + 9(-2 + r) = 7
3r + (-2 * 9 + r * 9) = 7
3r + (-18 + 9r) = 7

Reorder the terms:
-18 + 3r + 9r = 7

Combine like terms: 3r + 9r = 12r
-18 + 12r = 7

Solving
-18 + 12r = 7

Solving for variable 'r'.

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

Add '18' to each side of the equation.
-18 + 18 + 12r = 7 + 18

Combine like terms: -18 + 18 = 0
0 + 12r = 7 + 18
12r = 7 + 18

Combine like terms: 7 + 18 = 25
12r = 25

Divide each side by '12'.
r = 2.083333333

Simplifying
r = 2.083333333

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