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Simplifying 21 + x = 2(-2 + -5) + 6x Combine like terms: -2 + -5 = -7 21 + x = 2(-7) + 6x Multiply 2 * -7 21 + x = -14 + 6x Solving 21 + x = -14 + 6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6x' to each side of the equation. 21 + x + -6x = -14 + 6x + -6x Combine like terms: x + -6x = -5x 21 + -5x = -14 + 6x + -6x Combine like terms: 6x + -6x = 0 21 + -5x = -14 + 0 21 + -5x = -14 Add '-21' to each side of the equation. 21 + -21 + -5x = -14 + -21 Combine like terms: 21 + -21 = 0 0 + -5x = -14 + -21 -5x = -14 + -21 Combine like terms: -14 + -21 = -35 -5x = -35 Divide each side by '-5'. x = 7 Simplifying x = 7
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