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Simplifying 4x + -2(x + -3) = 21 Reorder the terms: 4x + -2(-3 + x) = 21 4x + (-3 * -2 + x * -2) = 21 4x + (6 + -2x) = 21 Reorder the terms: 6 + 4x + -2x = 21 Combine like terms: 4x + -2x = 2x 6 + 2x = 21 Solving 6 + 2x = 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 + 2x = 21 + -6 Combine like terms: 6 + -6 = 0 0 + 2x = 21 + -6 2x = 21 + -6 Combine like terms: 21 + -6 = 15 2x = 15 Divide each side by '2'. x = 7.5 Simplifying x = 7.5
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