9x^2+3r-30=0

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Solution for 9x^2+3r-30=0 equation:


Simplifying
9x2 + 3r + -30 = 0

Reorder the terms:
-30 + 3r + 9x2 = 0

Solving
-30 + 3r + 9x2 = 0

Solving for variable 'r'.

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

Add '30' to each side of the equation.
-30 + 3r + 30 + 9x2 = 0 + 30

Reorder the terms:
-30 + 30 + 3r + 9x2 = 0 + 30

Combine like terms: -30 + 30 = 0
0 + 3r + 9x2 = 0 + 30
3r + 9x2 = 0 + 30

Combine like terms: 0 + 30 = 30
3r + 9x2 = 30

Add '-9x2' to each side of the equation.
3r + 9x2 + -9x2 = 30 + -9x2

Combine like terms: 9x2 + -9x2 = 0
3r + 0 = 30 + -9x2
3r = 30 + -9x2

Divide each side by '3'.
r = 10 + -3x2

Simplifying
r = 10 + -3x2

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