-105=7(3+3r)

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Solution for -105=7(3+3r) equation:


Simplifying
-105 = 7(3 + 3r)
-105 = (3 * 7 + 3r * 7)
-105 = (21 + 21r)

Solving
-105 = 21 + 21r

Solving for variable 'r'.

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

Add '-21r' to each side of the equation.
-105 + -21r = 21 + 21r + -21r

Combine like terms: 21r + -21r = 0
-105 + -21r = 21 + 0
-105 + -21r = 21

Add '105' to each side of the equation.
-105 + 105 + -21r = 21 + 105

Combine like terms: -105 + 105 = 0
0 + -21r = 21 + 105
-21r = 21 + 105

Combine like terms: 21 + 105 = 126
-21r = 126

Divide each side by '-21'.
r = -6

Simplifying
r = -6

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