-7(1+3r)=140

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Solution for -7(1+3r)=140 equation: 


Simplifying
-7(1 + 3r) = 140
(1 * -7 + 3r * -7) = 140
(-7 + -21r) = 140

Solving
-7 + -21r = 140

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 + -21r = 140 + 7

Combine like terms: -7 + 7 = 0
0 + -21r = 140 + 7
-21r = 140 + 7

Combine like terms: 140 + 7 = 147
-21r = 147

Divide each side by '-21'.
r = -7

Simplifying
r = -7

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