3a+b=90

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Solution for 3a+b=90 equation: 


Simplifying
3a + b = 90

Solving
3a + b = 90

Solving for variable 'a'.

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

Add '-1b' to each side of the equation.
3a + b + -1b = 90 + -1b

Combine like terms: b + -1b = 0
3a + 0 = 90 + -1b
3a = 90 + -1b

Divide each side by '3'.
a = 30 + -0.3333333333b

Simplifying
a = 30 + -0.3333333333b

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