7(1-2r)=-105

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Solution for 7(1-2r)=-105 equation: 


Simplifying
7(1 + -2r) = -105
(1 * 7 + -2r * 7) = -105
(7 + -14r) = -105

Solving
7 + -14r = -105

Solving for variable 'r'.

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

Add '-7' to each side of the equation.
7 + -7 + -14r = -105 + -7

Combine like terms: 7 + -7 = 0
0 + -14r = -105 + -7
-14r = -105 + -7

Combine like terms: -105 + -7 = -112
-14r = -112

Divide each side by '-14'.
r = 8

Simplifying
r = 8

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