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5x=20-10
5x=10
x=2
cuma tau PLSV maaf
1. 20x + 7 = 147
20x = 147-7
20x = 140
x = 140 : 20
x = 7
2. 7x + 2 = 2x + 12
7x - 2x = 12 - 2
5x = 10
x = 10 : 5
x = 2
3. 4(x + 7) = 2(x - 5)
4x + 28 = 2x - 10
28 + 10 = 2x - 4x
38 = -2x
-x = 38 : 2
-x = 19
x = -19
Mungkin seperti itu, semoga membantu dan maaf apabila ada yang tidak dimengerti