6(5r+7u)=21

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Solution for 6(5r+7u)=21 equation: 


Simplifying
6(5r + 7u) = 21
(5r * 6 + 7u * 6) = 21
(30r + 42u) = 21

Solving
30r + 42u = 21

Solving for variable 'r'.

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

Add '-42u' to each side of the equation.
30r + 42u + -42u = 21 + -42u

Combine like terms: 42u + -42u = 0
30r + 0 = 21 + -42u
30r = 21 + -42u

Divide each side by '30'.
r = 0.7 + -1.4u

Simplifying
r = 0.7 + -1.4u

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