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Simplifying 78(x + -15) = 21 Reorder the terms: 78(-15 + x) = 21 (-15 * 78 + x * 78) = 21 (-1170 + 78x) = 21 Solving -1170 + 78x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1170' to each side of the equation. -1170 + 1170 + 78x = 21 + 1170 Combine like terms: -1170 + 1170 = 0 0 + 78x = 21 + 1170 78x = 21 + 1170 Combine like terms: 21 + 1170 = 1191 78x = 1191 Divide each side by '78'. x = 15.26923077 Simplifying x = 15.26923077
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