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Simplifying 7x + 54 = 3x + 90 Reorder the terms: 54 + 7x = 3x + 90 Reorder the terms: 54 + 7x = 90 + 3x Solving 54 + 7x = 90 + 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. 54 + 7x + -3x = 90 + 3x + -3x Combine like terms: 7x + -3x = 4x 54 + 4x = 90 + 3x + -3x Combine like terms: 3x + -3x = 0 54 + 4x = 90 + 0 54 + 4x = 90 Add '-54' to each side of the equation. 54 + -54 + 4x = 90 + -54 Combine like terms: 54 + -54 = 0 0 + 4x = 90 + -54 4x = 90 + -54 Combine like terms: 90 + -54 = 36 4x = 36 Divide each side by '4'. x = 9 Simplifying x = 9
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