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Simplifying -8(3x + -7) = 21x Reorder the terms: -8(-7 + 3x) = 21x (-7 * -8 + 3x * -8) = 21x (56 + -24x) = 21x Solving 56 + -24x = 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. 56 + -24x + -21x = 21x + -21x Combine like terms: -24x + -21x = -45x 56 + -45x = 21x + -21x Combine like terms: 21x + -21x = 0 56 + -45x = 0 Add '-56' to each side of the equation. 56 + -56 + -45x = 0 + -56 Combine like terms: 56 + -56 = 0 0 + -45x = 0 + -56 -45x = 0 + -56 Combine like terms: 0 + -56 = -56 -45x = -56 Divide each side by '-45'. x = 1.244444444 Simplifying x = 1.244444444
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