4a+-3b=21

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Solution for 4a+-3b=21 equation: 


Simplifying
4a + -3b = 21

Solving
4a + -3b = 21

Solving for variable 'a'.

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

Add '3b' to each side of the equation.
4a + -3b + 3b = 21 + 3b

Combine like terms: -3b + 3b = 0
4a + 0 = 21 + 3b
4a = 21 + 3b

Divide each side by '4'.
a = 5.25 + 0.75b

Simplifying
a = 5.25 + 0.75b

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