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Simplifying 126 + -3x = 4x + 21 Reorder the terms: 126 + -3x = 21 + 4x Solving 126 + -3x = 21 + 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. 126 + -3x + -4x = 21 + 4x + -4x Combine like terms: -3x + -4x = -7x 126 + -7x = 21 + 4x + -4x Combine like terms: 4x + -4x = 0 126 + -7x = 21 + 0 126 + -7x = 21 Add '-126' to each side of the equation. 126 + -126 + -7x = 21 + -126 Combine like terms: 126 + -126 = 0 0 + -7x = 21 + -126 -7x = 21 + -126 Combine like terms: 21 + -126 = -105 -7x = -105 Divide each side by '-7'. x = 15 Simplifying x = 15
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