20=4(a)+5(b)

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Solution for 20=4(a)+5(b) equation:


Simplifying
20 = 4(a) + 5(b)

Solving
20 = 4a + 5b

Solving for variable 'a'.

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

Add '-4a' to each side of the equation.
20 + -4a = 4a + -4a + 5b

Combine like terms: 4a + -4a = 0
20 + -4a = 0 + 5b
20 + -4a = 5b

Add '-20' to each side of the equation.
20 + -20 + -4a = -20 + 5b

Combine like terms: 20 + -20 = 0
0 + -4a = -20 + 5b
-4a = -20 + 5b

Divide each side by '-4'.
a = 5 + -1.25b

Simplifying
a = 5 + -1.25b

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