0.4r-12=0.3r

Solution for 0.4r-12=0.3r equation:

Simplifying
0.4r + -12 = 0.3r

Reorder the terms:
-12 + 0.4r = 0.3r

Solving
-12 + 0.4r = 0.3r

Solving for variable 'r'.

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

Add '-0.3r' to each side of the equation.
-12 + 0.4r + -0.3r = 0.3r + -0.3r

Combine like terms: 0.4r + -0.3r = 0.1r
-12 + 0.1r = 0.3r + -0.3r

Combine like terms: 0.3r + -0.3r = 0.0
-12 + 0.1r = 0.0

Add '12' to each side of the equation.
-12 + 12 + 0.1r = 0.0 + 12

Combine like terms: -12 + 12 = 0
0 + 0.1r = 0.0 + 12
0.1r = 0.0 + 12

Combine like terms: 0.0 + 12 = 12
0.1r = 12

Divide each side by '0.1'.
r = 120

Simplifying
r = 120