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3x + 15 - x - 5 = 0
2x + 10 = 0
2x = 0 - 10
2x = -10
x = -10 : 2
= -5
3x+15-x-5=0
2x+10=0
2x=0-10
2x=-10
x=-10/2
x=-5
cek=3*(-5+5)-(-5-5)=0