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Simplifying 3x + 21 = 10x + -42 Reorder the terms: 21 + 3x = 10x + -42 Reorder the terms: 21 + 3x = -42 + 10x Solving 21 + 3x = -42 + 10x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10x' to each side of the equation. 21 + 3x + -10x = -42 + 10x + -10x Combine like terms: 3x + -10x = -7x 21 + -7x = -42 + 10x + -10x Combine like terms: 10x + -10x = 0 21 + -7x = -42 + 0 21 + -7x = -42 Add '-21' to each side of the equation. 21 + -21 + -7x = -42 + -21 Combine like terms: 21 + -21 = 0 0 + -7x = -42 + -21 -7x = -42 + -21 Combine like terms: -42 + -21 = -63 -7x = -63 Divide each side by '-7'. x = 9 Simplifying x = 9
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