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Simplifying 3(2 + -1x) = 42 + -7x (2 * 3 + -1x * 3) = 42 + -7x (6 + -3x) = 42 + -7x Solving 6 + -3x = 42 + -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. 6 + -3x + 7x = 42 + -7x + 7x Combine like terms: -3x + 7x = 4x 6 + 4x = 42 + -7x + 7x Combine like terms: -7x + 7x = 0 6 + 4x = 42 + 0 6 + 4x = 42 Add '-6' to each side of the equation. 6 + -6 + 4x = 42 + -6 Combine like terms: 6 + -6 = 0 0 + 4x = 42 + -6 4x = 42 + -6 Combine like terms: 42 + -6 = 36 4x = 36 Divide each side by '4'. x = 9 Simplifying x = 9
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