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Simplifying 7x + 3(-0.5x + -5) = 21 Reorder the terms: 7x + 3(-5 + -0.5x) = 21 7x + (-5 * 3 + -0.5x * 3) = 21 7x + (-15 + -1.5x) = 21 Reorder the terms: -15 + 7x + -1.5x = 21 Combine like terms: 7x + -1.5x = 5.5x -15 + 5.5x = 21 Solving -15 + 5.5x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 5.5x = 21 + 15 Combine like terms: -15 + 15 = 0 0 + 5.5x = 21 + 15 5.5x = 21 + 15 Combine like terms: 21 + 15 = 36 5.5x = 36 Divide each side by '5.5'. x = 6.545454545 Simplifying x = 6.545454545
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