-5(2r-0.3)+0.5(4r+3)=-21

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Solution for -5(2r-0.3)+0.5(4r+3)=-21 equation:


Simplifying
-5(2r + -0.3) + 0.5(4r + 3) = -21

Reorder the terms:
-5(-0.3 + 2r) + 0.5(4r + 3) = -21
(-0.3 * -5 + 2r * -5) + 0.5(4r + 3) = -21
(1.5 + -10r) + 0.5(4r + 3) = -21

Reorder the terms:
1.5 + -10r + 0.5(3 + 4r) = -21
1.5 + -10r + (3 * 0.5 + 4r * 0.5) = -21
1.5 + -10r + (1.5 + 2r) = -21

Reorder the terms:
1.5 + 1.5 + -10r + 2r = -21

Combine like terms: 1.5 + 1.5 = 3
3 + -10r + 2r = -21

Combine like terms: -10r + 2r = -8r
3 + -8r = -21

Solving
3 + -8r = -21

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 + -8r = -21 + -3

Combine like terms: 3 + -3 = 0
0 + -8r = -21 + -3
-8r = -21 + -3

Combine like terms: -21 + -3 = -24
-8r = -24

Divide each side by '-8'.
r = 3

Simplifying
r = 3

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