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Simplifying 9x + -42 + 30 = x + 15 Reorder the terms: -42 + 30 + 9x = x + 15 Combine like terms: -42 + 30 = -12 -12 + 9x = x + 15 Reorder the terms: -12 + 9x = 15 + x Solving -12 + 9x = 15 + 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. -12 + 9x + -1x = 15 + x + -1x Combine like terms: 9x + -1x = 8x -12 + 8x = 15 + x + -1x Combine like terms: x + -1x = 0 -12 + 8x = 15 + 0 -12 + 8x = 15 Add '12' to each side of the equation. -12 + 12 + 8x = 15 + 12 Combine like terms: -12 + 12 = 0 0 + 8x = 15 + 12 8x = 15 + 12 Combine like terms: 15 + 12 = 27 8x = 27 Divide each side by '8'. x = 3.375 Simplifying x = 3.375
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