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Simplifying x + 0.30(4) = 0.80(x + 4) Multiply 0.30 * 4 x + 1.2 = 0.80(x + 4) Reorder the terms: 1.2 + x = 0.80(x + 4) Reorder the terms: 1.2 + x = 0.80(4 + x) 1.2 + x = (4 * 0.80 + x * 0.80) 1.2 + x = (3.2 + 0.80x) Solving 1.2 + x = 3.2 + 0.80x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.80x' to each side of the equation. 1.2 + x + -0.80x = 3.2 + 0.80x + -0.80x Combine like terms: x + -0.80x = 0.2x 1.2 + 0.2x = 3.2 + 0.80x + -0.80x Combine like terms: 0.80x + -0.80x = 0.00 1.2 + 0.2x = 3.2 + 0.00 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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