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Step-by-step explanation:

Step 1:

(3x + 12y) + (10x - 5y)

{Distributive property A(B+C)=AB+AC}

Step 2:

(3x + 12y) + (-5y + 10x)

{Commutative property A+B = B+A}

Step 3:

3x + (12y - 5y) + 10x

{Associative property A+(B+C)=(A+B)+C}

Step 4:

3x + 10x + (12y - 5y)

{Commutative property A+B = B+A}

Step 5:

13x + 7y

{Simplification}

765238725478629038640962136509762139056074

step-by-step explanation:

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