-3[4-7x]=30

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Solution for -3[4-7x]=30 equation: 


Simplifying
-3[4 + -7x] = 30
[4 * -3 + -7x * -3] = 30
[-12 + 21x] = 30

Solving
-12 + 21x = 30

Solving for variable 'x'.

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

Add '12' to each side of the equation.
-12 + 12 + 21x = 30 + 12

Combine like terms: -12 + 12 = 0
0 + 21x = 30 + 12
21x = 30 + 12

Combine like terms: 30 + 12 = 42
21x = 42

Divide each side by '21'.
x = 2

Simplifying
x = 2

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