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Simplifying -42 = 7(3 + -1x) -42 = (3 * 7 + -1x * 7) -42 = (21 + -7x) Solving -42 = 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. -42 + 7x = 21 + -7x + 7x Combine like terms: -7x + 7x = 0 -42 + 7x = 21 + 0 -42 + 7x = 21 Add '42' to each side of the equation. -42 + 42 + 7x = 21 + 42 Combine like terms: -42 + 42 = 0 0 + 7x = 21 + 42 7x = 21 + 42 Combine like terms: 21 + 42 = 63 7x = 63 Divide each side by '7'. x = 9 Simplifying x = 9
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