3a+2.1+4a=-0.7

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Solution for 3a+2.1+4a=-0.7 equation: 


Simplifying
3a + 2.1 + 4a = -0.7

Reorder the terms:
2.1 + 3a + 4a = -0.7

Combine like terms: 3a + 4a = 7a
2.1 + 7a = -0.7

Solving
2.1 + 7a = -0.7

Solving for variable 'a'.

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

Add '-2.1' to each side of the equation.
2.1 + -2.1 + 7a = -0.7 + -2.1

Combine like terms: 2.1 + -2.1 = 0.0
0.0 + 7a = -0.7 + -2.1
7a = -0.7 + -2.1

Combine like terms: -0.7 + -2.1 = -2.8
7a = -2.8

Divide each side by '7'.
a = -0.4

Simplifying
a = -0.4

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