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Simplifying 7(x + -6) + 21 = 0 Reorder the terms: 7(-6 + x) + 21 = 0 (-6 * 7 + x * 7) + 21 = 0 (-42 + 7x) + 21 = 0 Reorder the terms: -42 + 21 + 7x = 0 Combine like terms: -42 + 21 = -21 -21 + 7x = 0 Solving -21 + 7x = 0 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 + 7x = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 7x = 0 + 21 7x = 0 + 21 Combine like terms: 0 + 21 = 21 7x = 21 Divide each side by '7'. x = 3 Simplifying x = 3
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