90=-5(8-4r)+6r

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Solution for 90=-5(8-4r)+6r equation:


Simplifying
90 = -5(8 + -4r) + 6r
90 = (8 * -5 + -4r * -5) + 6r
90 = (-40 + 20r) + 6r

Combine like terms: 20r + 6r = 26r
90 = -40 + 26r

Solving
90 = -40 + 26r

Solving for variable 'r'.

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

Add '-26r' to each side of the equation.
90 + -26r = -40 + 26r + -26r

Combine like terms: 26r + -26r = 0
90 + -26r = -40 + 0
90 + -26r = -40

Add '-90' to each side of the equation.
90 + -90 + -26r = -40 + -90

Combine like terms: 90 + -90 = 0
0 + -26r = -40 + -90
-26r = -40 + -90

Combine like terms: -40 + -90 = -130
-26r = -130

Divide each side by '-26'.
r = 5

Simplifying
r = 5

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