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Simplifying 21 + -6x = -4x + 3(21 + -21x) 21 + -6x = -4x + (21 * 3 + -21x * 3) 21 + -6x = -4x + (63 + -63x) Reorder the terms: 21 + -6x = 63 + -4x + -63x Combine like terms: -4x + -63x = -67x 21 + -6x = 63 + -67x Solving 21 + -6x = 63 + -67x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '67x' to each side of the equation. 21 + -6x + 67x = 63 + -67x + 67x Combine like terms: -6x + 67x = 61x 21 + 61x = 63 + -67x + 67x Combine like terms: -67x + 67x = 0 21 + 61x = 63 + 0 21 + 61x = 63 Add '-21' to each side of the equation. 21 + -21 + 61x = 63 + -21 Combine like terms: 21 + -21 = 0 0 + 61x = 63 + -21 61x = 63 + -21 Combine like terms: 63 + -21 = 42 61x = 42 Divide each side by '61'. x = 0.6885245902 Simplifying x = 0.6885245902
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