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Simplifying -63 = 2x + -7(2x + 21) Reorder the terms: -63 = 2x + -7(21 + 2x) -63 = 2x + (21 * -7 + 2x * -7) -63 = 2x + (-147 + -14x) Reorder the terms: -63 = -147 + 2x + -14x Combine like terms: 2x + -14x = -12x -63 = -147 + -12x Solving -63 = -147 + -12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12x' to each side of the equation. -63 + 12x = -147 + -12x + 12x Combine like terms: -12x + 12x = 0 -63 + 12x = -147 + 0 -63 + 12x = -147 Add '63' to each side of the equation. -63 + 63 + 12x = -147 + 63 Combine like terms: -63 + 63 = 0 0 + 12x = -147 + 63 12x = -147 + 63 Combine like terms: -147 + 63 = -84 12x = -84 Divide each side by '12'. x = -7 Simplifying x = -7
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