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Simplifying 4(3x + -2.1) = 7x + -8.4 Reorder the terms: 4(-2.1 + 3x) = 7x + -8.4 (-2.1 * 4 + 3x * 4) = 7x + -8.4 (-8.4 + 12x) = 7x + -8.4 Reorder the terms: -8.4 + 12x = -8.4 + 7x Add '8.4' to each side of the equation. -8.4 + 8.4 + 12x = -8.4 + 8.4 + 7x Combine like terms: -8.4 + 8.4 = 0.0 0.0 + 12x = -8.4 + 8.4 + 7x 12x = -8.4 + 8.4 + 7x Combine like terms: -8.4 + 8.4 = 0.0 12x = 0.0 + 7x 12x = 7x Solving 12x = 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 12x + -7x = 7x + -7x Combine like terms: 12x + -7x = 5x 5x = 7x + -7x Combine like terms: 7x + -7x = 0 5x = 0 Divide each side by '5'. x = 0 Simplifying x = 0
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