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70x - 40 = 100
70x = 100 + 40
x = 140/70
x = 2
b.) sederhanakan kalikan 4 semua
2x - x = 8
x = 8
7x/10=10+4
7x/10=14
7x=140
x=140/7
x=20
x/2-x/4=2
4x-2x/8=2
2x/8=2
2x=16
x=16/2
x=8
yah semoga bermanfaat yaaa :)