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8*((1/2)*x+35)+3*x = 0
8*(1/2*x+35)+3*x = 0
8*(1/2*x+35)+3*x = 0
7*x+280 = 0
7*x+280 = 0
7*x+280 = 0 // - 280
7*x = -280 // : 7
x = -280/7
x = -40
x = -40
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