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(1+1,3x) (1-1,3x)-(0,7x+2)(2-0,7x) = 1²-(1,3x)² - (2²-(0,7x)²= 1-1,69x²-4+0,49x²=-3-1,2x²=-3-1,2*0,25=-3-0,3=-3,3