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Simplifying 12 + -18 + 3(7x + -13) = 49 Reorder the terms: 12 + -18 + 3(-13 + 7x) = 49 12 + -18 + (-13 * 3 + 7x * 3) = 49 12 + -18 + (-39 + 21x) = 49 Combine like terms: 12 + -18 = -6 -6 + -39 + 21x = 49 Combine like terms: -6 + -39 = -45 -45 + 21x = 49 Solving -45 + 21x = 49 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 + 21x = 49 + 45 Combine like terms: -45 + 45 = 0 0 + 21x = 49 + 45 21x = 49 + 45 Combine like terms: 49 + 45 = 94 21x = 94 Divide each side by '21'. x = 4.476190476 Simplifying x = 4.476190476
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