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Simplifying 7x + 3(x + -5) = 42 Reorder the terms: 7x + 3(-5 + x) = 42 7x + (-5 * 3 + x * 3) = 42 7x + (-15 + 3x) = 42 Reorder the terms: -15 + 7x + 3x = 42 Combine like terms: 7x + 3x = 10x -15 + 10x = 42 Solving -15 + 10x = 42 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 + 10x = 42 + 15 Combine like terms: -15 + 15 = 0 0 + 10x = 42 + 15 10x = 42 + 15 Combine like terms: 42 + 15 = 57 10x = 57 Divide each side by '10'. x = 5.7 Simplifying x = 5.7
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