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Simplifying 21 + -8x = 3(1 + 6) + -6 Combine like terms: 1 + 6 = 7 21 + -8x = 3(7) + -6 Multiply 3 * 7 21 + -8x = 21 + -6 Combine like terms: 21 + -6 = 15 21 + -8x = 15 Solving 21 + -8x = 15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -8x = 15 + -21 Combine like terms: 21 + -21 = 0 0 + -8x = 15 + -21 -8x = 15 + -21 Combine like terms: 15 + -21 = -6 -8x = -6 Divide each side by '-8'. x = 0.75 Simplifying x = 0.75
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