-3[2r+7]=3

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Solution for -3[2r+7]=3 equation:


Simplifying
-3[2r + 7] = 3

Reorder the terms:
-3[7 + 2r] = 3
[7 * -3 + 2r * -3] = 3
[-21 + -6r] = 3

Solving
-21 + -6r = 3

Solving for variable 'r'.

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

Add '21' to each side of the equation.
-21 + 21 + -6r = 3 + 21

Combine like terms: -21 + 21 = 0
0 + -6r = 3 + 21
-6r = 3 + 21

Combine like terms: 3 + 21 = 24
-6r = 24

Divide each side by '-6'.
r = -4

Simplifying
r = -4

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