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Simplifying 0.70x + -0.60(x + 20) = -0.40(20) Reorder the terms: 0.70x + -0.60(20 + x) = -0.40(20) 0.70x + (20 * -0.60 + x * -0.60) = -0.40(20) 0.70x + (-12 + -0.60x) = -0.40(20) Reorder the terms: -12 + 0.70x + -0.60x = -0.40(20) Combine like terms: 0.70x + -0.60x = 0.1x -12 + 0.1x = -0.40(20) Multiply -0.40 * 20 -12 + 0.1x = -8 Solving -12 + 0.1x = -8 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 0.1x = -8 + 12 Combine like terms: -12 + 12 = 0 0 + 0.1x = -8 + 12 0.1x = -8 + 12 Combine like terms: -8 + 12 = 4 0.1x = 4 Divide each side by '0.1'. x = 40 Simplifying x = 40
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