3(1.2b-1)-5a=4.2

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Solution for 3(1.2b-1)-5a=4.2 equation: 


Simplifying
3(1.2b + -1) + -5a = 4.2

Reorder the terms:
3(-1 + 1.2b) + -5a = 4.2
(-1 * 3 + 1.2b * 3) + -5a = 4.2
(-3 + 3.6b) + -5a = 4.2

Reorder the terms:
-3 + -5a + 3.6b = 4.2

Solving
-3 + -5a + 3.6b = 4.2

Solving for variable 'a'.

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

Add '3' to each side of the equation.
-3 + -5a + 3 + 3.6b = 4.2 + 3

Reorder the terms:
-3 + 3 + -5a + 3.6b = 4.2 + 3

Combine like terms: -3 + 3 = 0
0 + -5a + 3.6b = 4.2 + 3
-5a + 3.6b = 4.2 + 3

Combine like terms: 4.2 + 3 = 7.2
-5a + 3.6b = 7.2

Add '-3.6b' to each side of the equation.
-5a + 3.6b + -3.6b = 7.2 + -3.6b

Combine like terms: 3.6b + -3.6b = 0.0
-5a + 0.0 = 7.2 + -3.6b
-5a = 7.2 + -3.6b

Divide each side by '-5'.
a = -1.44 + 0.72b

Simplifying
a = -1.44 + 0.72b

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