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Simplifying -3x + -21 = 4(x + 7) Reorder the terms: -21 + -3x = 4(x + 7) Reorder the terms: -21 + -3x = 4(7 + x) -21 + -3x = (7 * 4 + x * 4) -21 + -3x = (28 + 4x) Solving -21 + -3x = 28 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. -21 + -3x + -4x = 28 + 4x + -4x Combine like terms: -3x + -4x = -7x -21 + -7x = 28 + 4x + -4x Combine like terms: 4x + -4x = 0 -21 + -7x = 28 + 0 -21 + -7x = 28 Add '21' to each side of the equation. -21 + 21 + -7x = 28 + 21 Combine like terms: -21 + 21 = 0 0 + -7x = 28 + 21 -7x = 28 + 21 Combine like terms: 28 + 21 = 49 -7x = 49 Divide each side by '-7'. x = -7 Simplifying x = -7
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