1.a. x+3=7 x=7-3 x=4
b. x-5=2 x=2+5 x=7
c. 2x=4 x=4:2 x=2
d. X/3=2 X/3-2=0 X-2*3=0 X-6=0 X=6
e. 2X+1=5 2X=4 X=4/2 X=2
f. 3X-2=13 3X=15 X=15/3 X=5
2a.4x+5=2x+9 4x-2x=9-5 2x=4 x=4/2 x=2
b) 5x-6=3x+8 5x-3x=8+6 2x=14 x=14/2 x=7
c) 2,6x-2=1,1x+2,5 2,6x-1,1x=2,5+2 3,7x=4,5 x=4,5/3,7 x=1,21