0.3(x+20)+0.7x=31

Solution for 0.3(x+20)+0.7x=31 equation:

Simplifying
0.3(x + 20) + 0.7x = 31

Reorder the terms:
0.3(20 + x) + 0.7x = 31
(20 * 0.3 + x * 0.3) + 0.7x = 31
(6 + 0.3x) + 0.7x = 31

Combine like terms: 0.3x + 0.7x = 1x
6 + 1x = 31

Solving
6 + 1x = 31

Solving for variable 'x'.

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

Add '-6' to each side of the equation.
6 + -6 + 1x = 31 + -6

Combine like terms: 6 + -6 = 0
0 + 1x = 31 + -6
1x = 31 + -6

Combine like terms: 31 + -6 = 25
1x = 25

Divide each side by '1'.
x = 25

Simplifying
x = 25