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Simplifying 63 + -7x = 21x + 20 Reorder the terms: 63 + -7x = 20 + 21x Solving 63 + -7x = 20 + 21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21x' to each side of the equation. 63 + -7x + -21x = 20 + 21x + -21x Combine like terms: -7x + -21x = -28x 63 + -28x = 20 + 21x + -21x Combine like terms: 21x + -21x = 0 63 + -28x = 20 + 0 63 + -28x = 20 Add '-63' to each side of the equation. 63 + -63 + -28x = 20 + -63 Combine like terms: 63 + -63 = 0 0 + -28x = 20 + -63 -28x = 20 + -63 Combine like terms: 20 + -63 = -43 -28x = -43 Divide each side by '-28'. x = 1.535714286 Simplifying x = 1.535714286
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