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Simplifying 0.8x + -0.3(12 + -4x) = -0.6(x + -7) 0.8x + (12 * -0.3 + -4x * -0.3) = -0.6(x + -7) 0.8x + (-3.6 + 1.2x) = -0.6(x + -7) Reorder the terms: -3.6 + 0.8x + 1.2x = -0.6(x + -7) Combine like terms: 0.8x + 1.2x = 2x -3.6 + 2x = -0.6(x + -7) Reorder the terms: -3.6 + 2x = -0.6(-7 + x) -3.6 + 2x = (-7 * -0.6 + x * -0.6) -3.6 + 2x = (4.2 + -0.6x) Solving -3.6 + 2x = 4.2 + -0.6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6x' to each side of the equation. -3.6 + 2x + 0.6x = 4.2 + -0.6x + 0.6x Combine like terms: 2x + 0.6x = 2.6x -3.6 + 2.6x = 4.2 + -0.6x + 0.6x Combine like terms: -0.6x + 0.6x = 0.0 -3.6 + 2.6x = 4.2 + 0.0 -3.6 + 2.6x = 4.2 Add '3.6' to each side of the equation. -3.6 + 3.6 + 2.6x = 4.2 + 3.6 Combine like terms: -3.6 + 3.6 = 0.0 0.0 + 2.6x = 4.2 + 3.6 2.6x = 4.2 + 3.6 Combine like terms: 4.2 + 3.6 = 7.8 2.6x = 7.8 Divide each side by '2.6'. x = 3 Simplifying x = 3
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