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Simplifying 2 + -4(1 + 3x) = -21 2 + (1 * -4 + 3x * -4) = -21 2 + (-4 + -12x) = -21 Combine like terms: 2 + -4 = -2 -2 + -12x = -21 Solving -2 + -12x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + -12x = -21 + 2 Combine like terms: -2 + 2 = 0 0 + -12x = -21 + 2 -12x = -21 + 2 Combine like terms: -21 + 2 = -19 -12x = -19 Divide each side by '-12'. x = 1.583333333 Simplifying x = 1.583333333
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