1.78=890*r*.5

Solution for 1.78=890*r*.5 equation:

Simplifying
1.78 = 890r * 0.5

Reorder the terms for easier multiplication:
1.78 = 890 * 0.5r

Multiply 890 * 0.5
1.78 = 445r

Solving
1.78 = 445r

Solving for variable 'r'.

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

Add '-445r' to each side of the equation.
1.78 + -445r = 445r + -445r

Combine like terms: 445r + -445r = 0
1.78 + -445r = 0

Add '-1.78' to each side of the equation.
1.78 + -1.78 + -445r = 0 + -1.78

Combine like terms: 1.78 + -1.78 = 0.00
0.00 + -445r = 0 + -1.78
-445r = 0 + -1.78

Combine like terms: 0 + -1.78 = -1.78
-445r = -1.78

Divide each side by '-445'.
r = 0.004

Simplifying
r = 0.004