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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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