3=2(5-r)

Solution for 3=2(5-r) equation:

Simplifying
3 = 2(5 + -1r)
3 = (5 * 2 + -1r * 2)
3 = (10 + -2r)

Solving
3 = 10 + -2r

Solving for variable 'r'.

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

Add '2r' to each side of the equation.
3 + 2r = 10 + -2r + 2r

Combine like terms: -2r + 2r = 0
3 + 2r = 10 + 0
3 + 2r = 10

Add '-3' to each side of the equation.
3 + -3 + 2r = 10 + -3

Combine like terms: 3 + -3 = 0
0 + 2r = 10 + -3
2r = 10 + -3

Combine like terms: 10 + -3 = 7
2r = 7

Divide each side by '2'.
r = 3.5

Simplifying
r = 3.5