50r+30-8(5r+9)=

Solution for 50r+30-8(5r+9)= equation:

Simplifying
50r + 30 + -8(5r + 9) = 0

Reorder the terms:
50r + 30 + -8(9 + 5r) = 0
50r + 30 + (9 * -8 + 5r * -8) = 0
50r + 30 + (-72 + -40r) = 0

Reorder the terms:
30 + -72 + 50r + -40r = 0

Combine like terms: 30 + -72 = -42
-42 + 50r + -40r = 0

Combine like terms: 50r + -40r = 10r
-42 + 10r = 0

Solving
-42 + 10r = 0

Solving for variable 'r'.

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

Add '42' to each side of the equation.
-42 + 42 + 10r = 0 + 42

Combine like terms: -42 + 42 = 0
0 + 10r = 0 + 42
10r = 0 + 42

Combine like terms: 0 + 42 = 42
10r = 42

Divide each side by '10'.
r = 4.2

Simplifying
r = 4.2