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Simplifying 30 + 12 = 4x + 9 Combine like terms: 30 + 12 = 42 42 = 4x + 9 Reorder the terms: 42 = 9 + 4x Solving 42 = 9 + 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. 42 + -4x = 9 + 4x + -4x Combine like terms: 4x + -4x = 0 42 + -4x = 9 + 0 42 + -4x = 9 Add '-42' to each side of the equation. 42 + -42 + -4x = 9 + -42 Combine like terms: 42 + -42 = 0 0 + -4x = 9 + -42 -4x = 9 + -42 Combine like terms: 9 + -42 = -33 -4x = -33 Divide each side by '-4'. x = 8.25 Simplifying x = 8.25
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