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Simplifying 21 + -15 + 13x = -11 + 15x Combine like terms: 21 + -15 = 6 6 + 13x = -11 + 15x Solving 6 + 13x = -11 + 15x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15x' to each side of the equation. 6 + 13x + -15x = -11 + 15x + -15x Combine like terms: 13x + -15x = -2x 6 + -2x = -11 + 15x + -15x Combine like terms: 15x + -15x = 0 6 + -2x = -11 + 0 6 + -2x = -11 Add '-6' to each side of the equation. 6 + -6 + -2x = -11 + -6 Combine like terms: 6 + -6 = 0 0 + -2x = -11 + -6 -2x = -11 + -6 Combine like terms: -11 + -6 = -17 -2x = -17 Divide each side by '-2'. x = 8.5 Simplifying x = 8.5
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