7r^2-2-5r=0

Solution for 7r^2-2-5r=0 equation:

Simplifying
7r2 + -2 + -5r = 0

Reorder the terms:
-2 + -5r + 7r2 = 0

Solving
-2 + -5r + 7r2 = 0

Solving for variable 'r'.

Factor a trinomial.
(-2 + -7r)(1 + -1r) = 0

Subproblem 1
Set the factor '(-2 + -7r)' equal to zero and attempt to solve:

Simplifying
-2 + -7r = 0

Solving
-2 + -7r = 0

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

Add '2' to each side of the equation.
-2 + 2 + -7r = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -7r = 0 + 2
-7r = 0 + 2

Combine like terms: 0 + 2 = 2
-7r = 2

Divide each side by '-7'.
r = -0.2857142857

Simplifying
r = -0.2857142857
Subproblem 2
Set the factor '(1 + -1r)' equal to zero and attempt to solve:

Simplifying
1 + -1r = 0

Solving
1 + -1r = 0

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

Add '-1' to each side of the equation.
1 + -1 + -1r = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -1r = 0 + -1
-1r = 0 + -1

Combine like terms: 0 + -1 = -1
-1r = -1

Divide each side by '-1'.
r = 1

Simplifying
r = 1
Solution
r = {-0.2857142857, 1}