21=6r+5-7e

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Solution for 21=6r+5-7e equation:


Simplifying
21 = 6r + 5 + -7e

Reorder the terms:
21 = 5 + -7e + 6r

Solving
21 = 5 + -7e + 6r

Solving for variable 'e'.

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

Add '7e' to each side of the equation.
21 + 7e = 5 + -7e + 7e + 6r

Combine like terms: -7e + 7e = 0
21 + 7e = 5 + 0 + 6r
21 + 7e = 5 + 6r

Add '-21' to each side of the equation.
21 + -21 + 7e = 5 + -21 + 6r

Combine like terms: 21 + -21 = 0
0 + 7e = 5 + -21 + 6r
7e = 5 + -21 + 6r

Combine like terms: 5 + -21 = -16
7e = -16 + 6r

Divide each side by '7'.
e = -2.285714286 + 0.8571428571r

Simplifying
e = -2.285714286 + 0.8571428571r

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