(A). the correct solution is =2x+4=10 2x=10-4(Collection of terms). 2x=6(Divide by the coefficient of the unknown (x). : 2x/2=6/2 x=3 (B). the mistake oliver made was that he added the equation instead of subtracting it = 10+4 , instead of 10-4. before dividing. Mark As Brianliest