Answer:
Step-by-step explanation:
1. First of all we have this equation:
3(x + 4y) + 5(2x - y)
2. Let's apply distributive property:
3x+12y + 10x - 5y
3. Let's order this expression according to the variables:
3x + 10x + 12y-5y
4. Let's sum equal terms:
13x + 7y
