57=30-3(x-4)

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Solution for 57=30-3(x-4) equation:


Simplifying
57 = 30 + -3(x + -4)

Reorder the terms:
57 = 30 + -3(-4 + x)
57 = 30 + (-4 * -3 + x * -3)
57 = 30 + (12 + -3x)

Combine like terms: 30 + 12 = 42
57 = 42 + -3x

Solving
57 = 42 + -3x

Solving for variable 'x'.

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

Add '3x' to each side of the equation.
57 + 3x = 42 + -3x + 3x

Combine like terms: -3x + 3x = 0
57 + 3x = 42 + 0
57 + 3x = 42

Add '-57' to each side of the equation.
57 + -57 + 3x = 42 + -57

Combine like terms: 57 + -57 = 0
0 + 3x = 42 + -57
3x = 42 + -57

Combine like terms: 42 + -57 = -15
3x = -15

Divide each side by '3'.
x = -5

Simplifying
x = -5

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