-5r+5(-8r+5)=-21+r

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Solution for -5r+5(-8r+5)=-21+r equation:


Simplifying
-5r + 5(-8r + 5) = -21 + r

Reorder the terms:
-5r + 5(5 + -8r) = -21 + r
-5r + (5 * 5 + -8r * 5) = -21 + r
-5r + (25 + -40r) = -21 + r

Reorder the terms:
25 + -5r + -40r = -21 + r

Combine like terms: -5r + -40r = -45r
25 + -45r = -21 + r

Solving
25 + -45r = -21 + r

Solving for variable 'r'.

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

Add '-1r' to each side of the equation.
25 + -45r + -1r = -21 + r + -1r

Combine like terms: -45r + -1r = -46r
25 + -46r = -21 + r + -1r

Combine like terms: r + -1r = 0
25 + -46r = -21 + 0
25 + -46r = -21

Add '-25' to each side of the equation.
25 + -25 + -46r = -21 + -25

Combine like terms: 25 + -25 = 0
0 + -46r = -21 + -25
-46r = -21 + -25

Combine like terms: -21 + -25 = -46
-46r = -46

Divide each side by '-46'.
r = 1

Simplifying
r = 1

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