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maka 5x-8 = 4
5x= 8+4
5x= 12
x= 12/5
x= 2,4
B.2x+5= 7-2x
maka 2x+2x = -5+7
4x= 2
x = 4/2 =2
C. x-1 + 2x+3x+1= 6
maka x+2x+3x =-1+6
5x=5
x=5/5= 1