Răspuns:
a) x+33=65 x=65-33 x=32
b )x-89=90 x=90+89 x=179
c) x:11=11 x=11·11 x=121
d) 4x-1=15 4x=16 x=16:4 x=4
e) 6x+3=39 6x=36 x=36:6 x=6
f) 7x-1=69 7x=70 x=70:7 x=10
g) (13:x-1)•13=0 13:x-1=0·13 13:x-1=0 13:x=1 x=13:1 x=13
h) 14-x=10 x=14-10 x=4
i) (5x-7):3=11 5x-7=11·3 5x=33+7 5x=40 x=40:5 x=8
j) [(3x-2)•5-1]:2+5=7 [(3x-2)•5-1]:2=7-5 (3x-2)•5-1=2·2
(3x-2)•5=4+1 3x-2=5:5 3x=1+2 3x=3 x=1
Explicație pas cu pas: