10r-30=3r-9

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Solution for 10r-30=3r-9 equation:


Simplifying
10r + -30 = 3r + -9

Reorder the terms:
-30 + 10r = 3r + -9

Reorder the terms:
-30 + 10r = -9 + 3r

Solving
-30 + 10r = -9 + 3r

Solving for variable 'r'.

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

Add '-3r' to each side of the equation.
-30 + 10r + -3r = -9 + 3r + -3r

Combine like terms: 10r + -3r = 7r
-30 + 7r = -9 + 3r + -3r

Combine like terms: 3r + -3r = 0
-30 + 7r = -9 + 0
-30 + 7r = -9

Add '30' to each side of the equation.
-30 + 30 + 7r = -9 + 30

Combine like terms: -30 + 30 = 0
0 + 7r = -9 + 30
7r = -9 + 30

Combine like terms: -9 + 30 = 21
7r = 21

Divide each side by '7'.
r = 3

Simplifying
r = 3

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