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Simplifying 21x + -30 = 12 * 7 * 5 Reorder the terms: -30 + 21x = 12 * 7 * 5 Multiply 12 * 7 -30 + 21x = 84 * 5 Multiply 84 * 5 -30 + 21x = 420 Solving -30 + 21x = 420 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + 21x = 420 + 30 Combine like terms: -30 + 30 = 0 0 + 21x = 420 + 30 21x = 420 + 30 Combine like terms: 420 + 30 = 450 21x = 450 Divide each side by '21'. x = 21.42857143 Simplifying x = 21.42857143
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