Solve the following: A) 2(x+3)=x-4

b) 4(5x-2)=2(9x+3)

C) 4x-1/2=x+7

D) 3x+2=2x+13/3

E) 2x-7/4= x+3/3

If m∠abc = 70°, what is m∠abd? justify your reasoning.  using the addition property of equality, 40 + 70 = 110, so m∠abd = 110°.  using the subtraction property of equality, 70 − 30 = 40, so m∠abd = 30°.  using the angle addition postulate, 40 + m∠abd = 70. so, m∠abd = 30° using the subtraction property of equality.  using the angle addition postulate, 40 + 70 = m∠abd. so, m∠abd = 110° using the addition property of equality.