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Simplifying 0.30x + 0.30(70) = 0.15(42) Multiply 0.30 * 70 0.30x + 21 = 0.15(42) Reorder the terms: 21 + 0.30x = 0.15(42) Multiply 0.15 * 42 21 + 0.30x = 6.3 Solving 21 + 0.30x = 6.3 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 0.30x = 6.3 + -21 Combine like terms: 21 + -21 = 0 0 + 0.30x = 6.3 + -21 0.30x = 6.3 + -21 Combine like terms: 6.3 + -21 = -14.7 0.30x = -14.7 Divide each side by '0.30'. x = -49 Simplifying x = -49
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