.15a+.42b=90

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Solution for .15a+.42b=90 equation: 


Simplifying
0.15a + 0.42b = 90

Solving
0.15a + 0.42b = 90

Solving for variable 'a'.

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

Add '-0.42b' to each side of the equation.
0.15a + 0.42b + -0.42b = 90 + -0.42b

Combine like terms: 0.42b + -0.42b = 0.00
0.15a + 0.00 = 90 + -0.42b
0.15a = 90 + -0.42b

Divide each side by '0.15'.
a = 600 + -2.8b

Simplifying
a = 600 + -2.8b

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