1.6=0.4(4+r)

Solution for 1.6=0.4(4+r) equation:

Simplifying
1.6 = 0.4(4 + r)
1.6 = (4 * 0.4 + r * 0.4)
1.6 = (1.6 + 0.4r)

Add '-1.6' to each side of the equation.
1.6 + -1.6 = 1.6 + -1.6 + 0.4r

Combine like terms: 1.6 + -1.6 = 0.0
0.0 = 1.6 + -1.6 + 0.4r

Combine like terms: 1.6 + -1.6 = 0.0
0.0 = 0.0 + 0.4r
0.0 = 0.4r

Solving
0.0 = 0.4r

Solving for variable 'r'.

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

Add '-0.4r' to each side of the equation.
0.0 + -0.4r = 0.4r + -0.4r
Remove the zero:
-0.4r = 0.4r + -0.4r

Combine like terms: 0.4r + -0.4r = 0.0
-0.4r = 0.0

Divide each side by '-0.4'.
r = 0

Simplifying
r = 0