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Simplifying 54 + -4x = 7x + 21 Reorder the terms: 54 + -4x = 21 + 7x Solving 54 + -4x = 21 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 54 + -4x + -7x = 21 + 7x + -7x Combine like terms: -4x + -7x = -11x 54 + -11x = 21 + 7x + -7x Combine like terms: 7x + -7x = 0 54 + -11x = 21 + 0 54 + -11x = 21 Add '-54' to each side of the equation. 54 + -54 + -11x = 21 + -54 Combine like terms: 54 + -54 = 0 0 + -11x = 21 + -54 -11x = 21 + -54 Combine like terms: 21 + -54 = -33 -11x = -33 Divide each side by '-11'. x = 3 Simplifying x = 3
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