a) √7 x +1 = √7 +1
√7 x = √7 +1-1,
√7 x=√7/:√7, x = 1
A={1}
b) 0,4x+3=5,4
0,4x=5,4-3, 0,4x = 2,4/:0,4
x = 6,
B={6}
c) 1+√7x= √8+1
√7x=√8+1-1,
√7x=√8, x=2√2/√7
x=(2/7)*√14
C={(2/7)*√14}
d) √3x/3= 3/√3
√3x/3=√3 (in partea dreapta rationalizam fractia si obtinem 3*√3/3=√3)
√3x= 3√3/:√3
x= 3, D={3}
7) 3x-57=0,
3x=57/:3
x= 19, S1={19}
-5x+95=0
-5x=-95/:(-5)
x= 19, S2={19}
S1=S2