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Simplifying 215 + x = 3x + 55 Reorder the terms: 215 + x = 55 + 3x Solving 215 + x = 55 + 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. 215 + x + -3x = 55 + 3x + -3x Combine like terms: x + -3x = -2x 215 + -2x = 55 + 3x + -3x Combine like terms: 3x + -3x = 0 215 + -2x = 55 + 0 215 + -2x = 55 Add '-215' to each side of the equation. 215 + -215 + -2x = 55 + -215 Combine like terms: 215 + -215 = 0 0 + -2x = 55 + -215 -2x = 55 + -215 Combine like terms: 55 + -215 = -160 -2x = -160 Divide each side by '-2'. x = 80 Simplifying x = 80
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