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Simplifying 4.2x + -9 = 3(1.2x + 4) Reorder the terms: -9 + 4.2x = 3(1.2x + 4) Reorder the terms: -9 + 4.2x = 3(4 + 1.2x) -9 + 4.2x = (4 * 3 + 1.2x * 3) -9 + 4.2x = (12 + 3.6x) Solving -9 + 4.2x = 12 + 3.6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.6x' to each side of the equation. -9 + 4.2x + -3.6x = 12 + 3.6x + -3.6x Combine like terms: 4.2x + -3.6x = 0.6x -9 + 0.6x = 12 + 3.6x + -3.6x Combine like terms: 3.6x + -3.6x = 0.0 -9 + 0.6x = 12 + 0.0 -9 + 0.6x = 12 Add '9' to each side of the equation. -9 + 9 + 0.6x = 12 + 9 Combine like terms: -9 + 9 = 0 0 + 0.6x = 12 + 9 0.6x = 12 + 9 Combine like terms: 12 + 9 = 21 0.6x = 21 Divide each side by '0.6'. x = 35 Simplifying x = 35
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