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Simplifying 10x = 3(x + -21) Reorder the terms: 10x = 3(-21 + x) 10x = (-21 * 3 + x * 3) 10x = (-63 + 3x) Solving 10x = -63 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 10x + -3x = -63 + 3x + -3x Combine like terms: 10x + -3x = 7x 7x = -63 + 3x + -3x Combine like terms: 3x + -3x = 0 7x = -63 + 0 7x = -63 Divide each side by '7'. x = -9 Simplifying x = -9
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