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Simplifying 0.3 * 4 + x = 0.8(x + 4) Multiply 0.3 * 4 1.2 + x = 0.8(x + 4) Reorder the terms: 1.2 + x = 0.8(4 + x) 1.2 + x = (4 * 0.8 + x * 0.8) 1.2 + x = (3.2 + 0.8x) Solving 1.2 + x = 3.2 + 0.8x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8x' to each side of the equation. 1.2 + x + -0.8x = 3.2 + 0.8x + -0.8x Combine like terms: x + -0.8x = 0.2x 1.2 + 0.2x = 3.2 + 0.8x + -0.8x Combine like terms: 0.8x + -0.8x = 0.0 1.2 + 0.2x = 3.2 + 0.0 1.2 + 0.2x = 3.2 Add '-1.2' to each side of the equation. 1.2 + -1.2 + 0.2x = 3.2 + -1.2 Combine like terms: 1.2 + -1.2 = 0.0 0.0 + 0.2x = 3.2 + -1.2 0.2x = 3.2 + -1.2 Combine like terms: 3.2 + -1.2 = 2 0.2x = 2 Divide each side by '0.2'. x = 10 Simplifying x = 10
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