1) (9х-4)+(15х-5)=18-(25-22х) 2) (10х+6)-(9-9х)+(8-11х)=-19
3) 7(х-1)-3(2х+1)=-х-15
4) (х^2+4x-8)-(7x-2x^2-5)=3x^2-(4x+4)
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