а)4,8х=25,92х=25,92/4,8х=5,4б)72х=36,288х=36,288/72х=0,504в)3,2х=2,32х=2,32/3,2х=0,725г)7,4х=703х=703/7,4х=95
d=a2-a1=1-(-1)=2
3) 2(z-35)+2z=130
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