Integral dari x-3/x+7 dx

u = x + 7
du = dx
= int (x - 3)/u du
dari u = x + 7
x = u - 7
= int (u - 7 - 3)/u du
= int (u - 10)u^-1 du
= int (1 - 10u^-1) du
= u - 10 ln(u) + c
= (x + 7) - 10 ln(x + 7) + c
= x + 7 - 10 ln(x + 7) + c