0.50x-0.40(30+x)=-0.30(30)

Solution for 0.50x-0.40(30+x)=-0.30(30) equation:

Simplifying
0.50x + -0.40(30 + x) = -0.30(30)
0.50x + (30 * -0.40 + x * -0.40) = -0.30(30)
0.50x + (-12 + -0.40x) = -0.30(30)

Reorder the terms:
-12 + 0.50x + -0.40x = -0.30(30)

Combine like terms: 0.50x + -0.40x = 0.1x
-12 + 0.1x = -0.30(30)

Multiply -0.30 * 30
-12 + 0.1x = -9

Solving
-12 + 0.1x = -9

Solving for variable 'x'.

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

Add '12' to each side of the equation.
-12 + 12 + 0.1x = -9 + 12

Combine like terms: -12 + 12 = 0
0 + 0.1x = -9 + 12
0.1x = -9 + 12

Combine like terms: -9 + 12 = 3
0.1x = 3

Divide each side by '0.1'.
x = 30

Simplifying
x = 30