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Simplifying (x + 2.1) + -1(0.5x + 3) = 12 Reorder the terms: (2.1 + x) + -1(0.5x + 3) = 12 Remove parenthesis around (2.1 + x) 2.1 + x + -1(0.5x + 3) = 12 Reorder the terms: 2.1 + x + -1(3 + 0.5x) = 12 2.1 + x + (3 * -1 + 0.5x * -1) = 12 2.1 + x + (-3 + -0.5x) = 12 Reorder the terms: 2.1 + -3 + x + -0.5x = 12 Combine like terms: 2.1 + -3 = -0.9 -0.9 + x + -0.5x = 12 Combine like terms: x + -0.5x = 0.5x -0.9 + 0.5x = 12 Solving -0.9 + 0.5x = 12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + 0.5x = 12 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + 0.5x = 12 + 0.9 0.5x = 12 + 0.9 Combine like terms: 12 + 0.9 = 12.9 0.5x = 12.9 Divide each side by '0.5'. x = 25.8 Simplifying x = 25.8
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