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Simplifying 4x + -15 = x + 42 Reorder the terms: -15 + 4x = x + 42 Reorder the terms: -15 + 4x = 42 + x Solving -15 + 4x = 42 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. -15 + 4x + -1x = 42 + x + -1x Combine like terms: 4x + -1x = 3x -15 + 3x = 42 + x + -1x Combine like terms: x + -1x = 0 -15 + 3x = 42 + 0 -15 + 3x = 42 Add '15' to each side of the equation. -15 + 15 + 3x = 42 + 15 Combine like terms: -15 + 15 = 0 0 + 3x = 42 + 15 3x = 42 + 15 Combine like terms: 42 + 15 = 57 3x = 57 Divide each side by '3'. x = 19 Simplifying x = 19
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