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karena sudah sama, (2x-3) diruas kiri dan kanan habis
jadi
x+1 = x^2+x-3
atau
x^2+x-3 = x+1
x^2+x-x = 1+3
x^2= 4
x = akar4
x = +-2
jadi, x = 2 atau x =-2