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Simplifying 3x + -3(7x + 15) = 99 Reorder the terms: 3x + -3(15 + 7x) = 99 3x + (15 * -3 + 7x * -3) = 99 3x + (-45 + -21x) = 99 Reorder the terms: -45 + 3x + -21x = 99 Combine like terms: 3x + -21x = -18x -45 + -18x = 99 Solving -45 + -18x = 99 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '45' to each side of the equation. -45 + 45 + -18x = 99 + 45 Combine like terms: -45 + 45 = 0 0 + -18x = 99 + 45 -18x = 99 + 45 Combine like terms: 99 + 45 = 144 -18x = 144 Divide each side by '-18'. x = -8 Simplifying x = -8
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