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-8(5x+5)+9x(10x+9)=20
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-8(5x+5)+9x(10x+9)=20

User Rhellem
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-8(5x+5)+9x(10x+9)=20\\-40x-40+90x^2+81x-20=0\\90x^2+41x-60=0\\\\\Delta=41^2-4\cdot90\cdot(-60)=1681+21600=23281\\\\x=(-41\pm √(23281))/(2\cdot90)=(-41\pm √(23281))/(180)

User Xaviera
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