1.2a+2.1a=3(.1a+4)

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Solution for 1.2a+2.1a=3(.1a+4) equation: 


Simplifying
1.2a + 2.1a = 3(0.1a + 4)

Combine like terms: 1.2a + 2.1a = 3.3a
3.3a = 3(0.1a + 4)

Reorder the terms:
3.3a = 3(4 + 0.1a)
3.3a = (4 * 3 + 0.1a * 3)
3.3a = (12 + 0.3a)

Solving
3.3a = 12 + 0.3a

Solving for variable 'a'.

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

Add '-0.3a' to each side of the equation.
3.3a + -0.3a = 12 + 0.3a + -0.3a

Combine like terms: 3.3a + -0.3a = 3a
3a = 12 + 0.3a + -0.3a

Combine like terms: 0.3a + -0.3a = 0.0
3a = 12 + 0.0
3a = 12

Divide each side by '3'.
a = 4

Simplifying
a = 4

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