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1b. x = 25
2a. x = 0
2b. x = 1
a.
2(a-3) = a-8
2a-6 = a-8
2a-a = -8+6
a = -2
b.
3(2x-5)-(5x-10)=20
6x-15-5x+10 = 20
x-5 = 20
x = 25
Nomor 2.
a.
2x + 4 = 4 + 3x
2x - 3x = 4 - 4
-x = 0
x = 0
b.
3x+5 = 6x+2
3x-6x = 2-5
-3x = -3
x = 1