3r-(7r+2)=12

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Solution for 3r-(7r+2)=12 equation:


Simplifying
3r + -1(7r + 2) = 12

Reorder the terms:
3r + -1(2 + 7r) = 12
3r + (2 * -1 + 7r * -1) = 12
3r + (-2 + -7r) = 12

Reorder the terms:
-2 + 3r + -7r = 12

Combine like terms: 3r + -7r = -4r
-2 + -4r = 12

Solving
-2 + -4r = 12

Solving for variable 'r'.

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

Add '2' to each side of the equation.
-2 + 2 + -4r = 12 + 2

Combine like terms: -2 + 2 = 0
0 + -4r = 12 + 2
-4r = 12 + 2

Combine like terms: 12 + 2 = 14
-4r = 14

Divide each side by '-4'.
r = -3.5

Simplifying
r = -3.5

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