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Simplifying 2x + 21 + -15x = 4 Reorder the terms: 21 + 2x + -15x = 4 Combine like terms: 2x + -15x = -13x 21 + -13x = 4 Solving 21 + -13x = 4 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -13x = 4 + -21 Combine like terms: 21 + -21 = 0 0 + -13x = 4 + -21 -13x = 4 + -21 Combine like terms: 4 + -21 = -17 -13x = -17 Divide each side by '-13'. x = 1.307692308 Simplifying x = 1.307692308
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