10r+3(-1+10r)=

Solution for 10r+3(-1+10r)= equation:

Simplifying
10r + 3(-1 + 10r) = 0
10r + (-1 * 3 + 10r * 3) = 0
10r + (-3 + 30r) = 0

Reorder the terms:
-3 + 10r + 30r = 0

Combine like terms: 10r + 30r = 40r
-3 + 40r = 0

Solving
-3 + 40r = 0

Solving for variable 'r'.

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

Add '3' to each side of the equation.
-3 + 3 + 40r = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 40r = 0 + 3
40r = 0 + 3

Combine like terms: 0 + 3 = 3
40r = 3

Divide each side by '40'.
r = 0.075

Simplifying
r = 0.075