7. a) x= 43-24 => x= 19
b) x= 43+24 => x= 67
c) x= 624:52= 12
d) x= 372:31= 12
e) 4*x= 57+7 => 4*x= 64 => x= 16
f) x= 124-124=0
8. inlocuim x pt a afla m
a) 7*4+m=33 => 28+m=33 => m= 5
b) 3*(-5)-2*m= -17 => -15-2*m= -17 => -2*m= -2 => m=1
c) 2*24+5*m=48 => 48+5*m=48 => 5*m=0=>m=0
