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(10x^2 ) - (x-21)=0
(10x^2+14x)+(-15x-21)=0
2x(5x+7)-3(5x+7)=0
(2x-3)(5x+7)=0
x1= 2x-3=0 x2= 5x+7=0
x=3/2 x=-7/5