[3-2r]=7

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


Simplifying
[3 + -2r] = 7

Remove brackets around [3 + -2r]
3 + -2r = 7

Solving
3 + -2r = 7

Solving for variable 'r'.

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

Add '-3' to each side of the equation.
3 + -3 + -2r = 7 + -3

Combine like terms: 3 + -3 = 0
0 + -2r = 7 + -3
-2r = 7 + -3

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

Divide each side by '-2'.
r = -2

Simplifying
r = -2

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