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Simplifying 4x + -30 = 42 Reorder the terms: -30 + 4x = 42 Solving -30 + 4x = 42 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + 4x = 42 + 30 Combine like terms: -30 + 30 = 0 0 + 4x = 42 + 30 4x = 42 + 30 Combine like terms: 42 + 30 = 72 4x = 72 Divide each side by '4'. x = 18 Simplifying x = 18
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