Solve and check the linear equation. 0.40x - 0.20(50 + x) = -0.04(50)
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If we expand the brackets we get 0.40x-10.00-0.20x=-2.00. That is, 0.20x-10.00=-2.00. Add 10.00 to each side: 0.20x=8.00, so, multiplying both sides by 10: 2x=80 and x=40. The original equation then becomes 16.00-0.20*90=16.00-18.00=-2.00=-0.04*50.

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