0.3(1+a)=2.1a

Solution for 0.3(1+a)=2.1a equation:

Simplifying
0.3(1 + a) = 2.1a
(1 * 0.3 + a * 0.3) = 2.1a
(0.3 + 0.3a) = 2.1a

Solving
0.3 + 0.3a = 2.1a

Solving for variable 'a'.

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

Add '-2.1a' to each side of the equation.
0.3 + 0.3a + -2.1a = 2.1a + -2.1a

Combine like terms: 0.3a + -2.1a = -1.8a
0.3 + -1.8a = 2.1a + -2.1a

Combine like terms: 2.1a + -2.1a = 0.0
0.3 + -1.8a = 0.0

Add '-0.3' to each side of the equation.
0.3 + -0.3 + -1.8a = 0.0 + -0.3

Combine like terms: 0.3 + -0.3 = 0.0
0.0 + -1.8a = 0.0 + -0.3
-1.8a = 0.0 + -0.3

Combine like terms: 0.0 + -0.3 = -0.3
-1.8a = -0.3

Divide each side by '-1.8'.
a = 0.1666666667

Simplifying
a = 0.1666666667