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3x+7=-5
3(-4)+7=-5
-12+7=-5
-5=-5 (memenuhi)
B.x=-6, -3x-5=13
-3x-5=13
-3(-6)-5=13
18-5=13
13=13(memenuhi)
C.x=12, 1/2x-4=1/3x-2
1/2x-4=1/3x-2
1/2(12)-4=1/3(12)-2
6-4=4-2
2=2(memenuhi)
D.y=9, y-7/2 -1/3=y-7/3
y-7/2 -1/3=y-7/3
9-7/2-1/3=9-7/3
18/2-7/2-1/3=27/3-7/3
11/2-1/3=20/3
11/2=20/3+1/3
11/2=21/3
5,5=7(tdk memenuhi)
E.x=200, 0,2(x-50)=20-0,05x
0,2(x-50)=20-0,05x
0,2(200-50)=20-0,05(200)
0,2(150)=20-10
30=10 (tdk memenuhi)