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If 5d - 12 = 8d + 18, then d =?

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76

1.based of the diagrams what is the the value of x? 2.how would you verify your answer for x

1. ∠1 is complementary to ∠2 and ∠3 is complementary to ∠2. subtraction property of equality 2. m∠1 + m∠2 = 90 and m∠3 + m∠2 = 90 substitution 3. m∠1 + m∠2 = m∠3 + m∠2 definition of complementary 4. m∠1 = m∠3 given