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Simplifying -21 = 7(3 + -1x) -21 = (3 * 7 + -1x * 7) -21 = (21 + -7x) Solving -21 = 21 + -7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7x' to each side of the equation. -21 + 7x = 21 + -7x + 7x Combine like terms: -7x + 7x = 0 -21 + 7x = 21 + 0 -21 + 7x = 21 Add '21' to each side of the equation. -21 + 21 + 7x = 21 + 21 Combine like terms: -21 + 21 = 0 0 + 7x = 21 + 21 7x = 21 + 21 Combine like terms: 21 + 21 = 42 7x = 42 Divide each side by '7'. x = 6 Simplifying x = 6
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