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Simplifying 7x + -1(4x + -6) = 21 Reorder the terms: 7x + -1(-6 + 4x) = 21 7x + (-6 * -1 + 4x * -1) = 21 7x + (6 + -4x) = 21 Reorder the terms: 6 + 7x + -4x = 21 Combine like terms: 7x + -4x = 3x 6 + 3x = 21 Solving 6 + 3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + 3x = 21 + -6 Combine like terms: 6 + -6 = 0 0 + 3x = 21 + -6 3x = 21 + -6 Combine like terms: 21 + -6 = 15 3x = 15 Divide each side by '3'. x = 5 Simplifying x = 5
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