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4*((1/2)*x+x)+8*x = 300 // - 300
4*((1/2)*x+x)+8*x-300 = 0
3/2*4*x+8*x-300 = 0
3/2*4*x+8*x-300 = 0
14*x-300 = 0
14*x-300 = 0
14*x-300 = 0 // + 300
14*x = 300 // : 14
x = 300/14
x = 150/7
x = 150/7
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