0.04x+0.03(x-20)=1.25

Solution for 0.04x+0.03(x-20)=1.25 equation:

Simplifying
0.04x + 0.03(x + -20) = 1.25

Reorder the terms:
0.04x + 0.03(-20 + x) = 1.25
0.04x + (-20 * 0.03 + x * 0.03) = 1.25
0.04x + (-0.6 + 0.03x) = 1.25

Reorder the terms:
-0.6 + 0.04x + 0.03x = 1.25

Combine like terms: 0.04x + 0.03x = 0.07x
-0.6 + 0.07x = 1.25

Solving
-0.6 + 0.07x = 1.25

Solving for variable 'x'.

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

Add '0.6' to each side of the equation.
-0.6 + 0.6 + 0.07x = 1.25 + 0.6

Combine like terms: -0.6 + 0.6 = 0.0
0.0 + 0.07x = 1.25 + 0.6
0.07x = 1.25 + 0.6

Combine like terms: 1.25 + 0.6 = 1.85
0.07x = 1.85

Divide each side by '0.07'.
x = 26.42857143

Simplifying
x = 26.42857143