Answer:
1. x+9=4
x=4-9
x=-5
2. 12-y=15
-y =15-12
-y=3
3=-y
3.7=3+2 (mali ata yung nilagay mo)
4.x-5=4
x=5+4
x=9
5. 4a +3= 15
4a=15-3
4a=12
a= 3
6.5x-7=x+9
5x-x=9+7
4x= 16
x=4
7.6x + 3 =2x + 11
6x+2x= 11-3
4x=8
x=2
8.2y + 15= 5y + 3
2y-5y=3-15
-3y=-12
y=4
9.7 (2a-1)=21
2a-1=3
2a=3+1
10.5 (2t - 3) =30
t=9/2
t=4 1/2 or t=4.5
