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Simplifying 4x + -1(7x + 21) = -15 Reorder the terms: 4x + -1(21 + 7x) = -15 4x + (21 * -1 + 7x * -1) = -15 4x + (-21 + -7x) = -15 Reorder the terms: -21 + 4x + -7x = -15 Combine like terms: 4x + -7x = -3x -21 + -3x = -15 Solving -21 + -3x = -15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + -3x = -15 + 21 Combine like terms: -21 + 21 = 0 0 + -3x = -15 + 21 -3x = -15 + 21 Combine like terms: -15 + 21 = 6 -3x = 6 Divide each side by '-3'. x = -2 Simplifying x = -2
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