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Simplifying 3x + -4(3 + -1x) = 30 3x + (3 * -4 + -1x * -4) = 30 3x + (-12 + 4x) = 30 Reorder the terms: -12 + 3x + 4x = 30 Combine like terms: 3x + 4x = 7x -12 + 7x = 30 Solving -12 + 7x = 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 + 7x = 30 + 12 Combine like terms: -12 + 12 = 0 0 + 7x = 30 + 12 7x = 30 + 12 Combine like terms: 30 + 12 = 42 7x = 42 Divide each side by '7'. x = 6 Simplifying x = 6
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