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Simplifying 7x + 7(x + -3) = 21 Reorder the terms: 7x + 7(-3 + x) = 21 7x + (-3 * 7 + x * 7) = 21 7x + (-21 + 7x) = 21 Reorder the terms: -21 + 7x + 7x = 21 Combine like terms: 7x + 7x = 14x -21 + 14x = 21 Solving -21 + 14x = 21 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 + 14x = 21 + 21 Combine like terms: -21 + 21 = 0 0 + 14x = 21 + 21 14x = 21 + 21 Combine like terms: 21 + 21 = 42 14x = 42 Divide each side by '14'. x = 3 Simplifying x = 3
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