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Simplifying 7x + -4(2 + -3x) = -21 7x + (2 * -4 + -3x * -4) = -21 7x + (-8 + 12x) = -21 Reorder the terms: -8 + 7x + 12x = -21 Combine like terms: 7x + 12x = 19x -8 + 19x = -21 Solving -8 + 19x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + 19x = -21 + 8 Combine like terms: -8 + 8 = 0 0 + 19x = -21 + 8 19x = -21 + 8 Combine like terms: -21 + 8 = -13 19x = -13 Divide each side by '19'. x = -0.6842105263 Simplifying x = -0.6842105263
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