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8x+56x+6x=350
8x+62x=350
60x=350|60
x=5.8
14x+56=350
14x=350-56
14x=294
x=21
8x²+56x+6x=350
8x²+62x=350
8x²=350-62x
8x=√350-62x/:8
x=√350-6x:8