-3x^2+3b+90=0

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Solution for -3x^2+3b+90=0 equation: 


Simplifying
-3x2 + 3b + 90 = 0

Reorder the terms:
90 + 3b + -3x2 = 0

Solving
90 + 3b + -3x2 = 0

Solving for variable 'b'.

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

Add '-90' to each side of the equation.
90 + 3b + -90 + -3x2 = 0 + -90

Reorder the terms:
90 + -90 + 3b + -3x2 = 0 + -90

Combine like terms: 90 + -90 = 0
0 + 3b + -3x2 = 0 + -90
3b + -3x2 = 0 + -90

Combine like terms: 0 + -90 = -90
3b + -3x2 = -90

Add '3x2' to each side of the equation.
3b + -3x2 + 3x2 = -90 + 3x2

Combine like terms: -3x2 + 3x2 = 0
3b + 0 = -90 + 3x2
3b = -90 + 3x2

Divide each side by '3'.
b = -30 + x2

Simplifying
b = -30 + x2

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