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Simplifying 0.3x + -0.5x + -7 = -21 Reorder the terms: -7 + 0.3x + -0.5x = -21 Combine like terms: 0.3x + -0.5x = -0.2x -7 + -0.2x = -21 Solving -7 + -0.2x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -0.2x = -21 + 7 Combine like terms: -7 + 7 = 0 0 + -0.2x = -21 + 7 -0.2x = -21 + 7 Combine like terms: -21 + 7 = -14 -0.2x = -14 Divide each side by '-0.2'. x = 70 Simplifying x = 70
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