ab - ac + 5b - 5c = b(a - c) + 5(b - c)ab - ac + 5b - 5c = b(a - c) + 5(b - c)ab - ac + 5b - 5c = b(a - c) + 5(b - c)
ab - ac + 5b - 5c = b(a - c) + 5(b - c)
ab - ac + 5b - 5c = b(a - c) + 5(b - c)
ab - ac + 5b - 5c = b(a - c) + 5(b - c)