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4x-x=9
3x=9
x=3
4b).3x^2+3x+x-1=3x^2
3x-1-1=0
2x-1=0
x=1/2
4c).x^2-x+4-4=x^2+3x+2-6
-x+4x-4=-3x+2x-6
3x-4=-x-6
4x=-2
x=-1/2 (negatif 1/2)
4d).-6x+2x+1=-4x+4+6x
-4x+1=2x+4
-4x+1=2x+4
-4x-2x=4-1
-6x=3
x=-1/2(negatif 1/2)
moga membntu jdkn jwbn trbaik ya mksih