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4(1-x)-3(x+2) = 19
4-4x-3x-6 = 19
-7x-2 = 19
-7x = 19+2
-7x = 21
x = 21/-7
x = -3 ... (b)
2)
Nilai Rini = nilai Roni
3x-5 = 2x+2
3x-2x = 2+5
x = 7 ... (a)