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Simplifying 7x + -3(7 + -1x) = 15 7x + (7 * -3 + -1x * -3) = 15 7x + (-21 + 3x) = 15 Reorder the terms: -21 + 7x + 3x = 15 Combine like terms: 7x + 3x = 10x -21 + 10x = 15 Solving -21 + 10x = 15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 10x = 15 + 21 Combine like terms: -21 + 21 = 0 0 + 10x = 15 + 21 10x = 15 + 21 Combine like terms: 15 + 21 = 36 10x = 36 Divide each side by '10'. x = 3.6 Simplifying x = 3.6
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