20=70*NA+90*NB

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Solution for 20=70*NA+90*NB equation: 


Simplifying
20 = 70NA + 90NB

Solving
20 = 70AN + 90BN

Solving for variable 'A'.

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

Add '-70AN' to each side of the equation.
20 + -70AN = 70AN + -70AN + 90BN

Combine like terms: 70AN + -70AN = 0
20 + -70AN = 0 + 90BN
20 + -70AN = 90BN

Add '-20' to each side of the equation.
20 + -20 + -70AN = -20 + 90BN

Combine like terms: 20 + -20 = 0
0 + -70AN = -20 + 90BN
-70AN = -20 + 90BN

Divide each side by '-70N'.
A = 0.2857142857N-1 + -1.285714286B

Simplifying
A = 0.2857142857N-1 + -1.285714286B

Reorder the terms:
A = -1.285714286B + 0.2857142857N-1

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