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Simplifying 4x + 21 = 142 + 15x Reorder the terms: 21 + 4x = 142 + 15x Solving 21 + 4x = 142 + 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. 21 + 4x + -15x = 142 + 15x + -15x Combine like terms: 4x + -15x = -11x 21 + -11x = 142 + 15x + -15x Combine like terms: 15x + -15x = 0 21 + -11x = 142 + 0 21 + -11x = 142 Add '-21' to each side of the equation. 21 + -21 + -11x = 142 + -21 Combine like terms: 21 + -21 = 0 0 + -11x = 142 + -21 -11x = 142 + -21 Combine like terms: 142 + -21 = 121 -11x = 121 Divide each side by '-11'. x = -11 Simplifying x = -11
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