105=7(7-r)

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Solution for 105=7(7-r) equation:


Simplifying
105 = 7(7 + -1r)
105 = (7 * 7 + -1r * 7)
105 = (49 + -7r)

Solving
105 = 49 + -7r

Solving for variable 'r'.

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

Add '7r' to each side of the equation.
105 + 7r = 49 + -7r + 7r

Combine like terms: -7r + 7r = 0
105 + 7r = 49 + 0
105 + 7r = 49

Add '-105' to each side of the equation.
105 + -105 + 7r = 49 + -105

Combine like terms: 105 + -105 = 0
0 + 7r = 49 + -105
7r = 49 + -105

Combine like terms: 49 + -105 = -56
7r = -56

Divide each side by '7'.
r = -8

Simplifying
r = -8

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