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put this solution on YOUR website!TO solve thie problem you should understand the distributive property. That is, the expression a(b + c) is the same thing as ab + ac. In this problem, you have:
3x + 2(5x - 7)
using the distributive property on the 2(5x -7) part of the expression, we get:

Next we group like terms:

So, the problem simplifies to 13x - 14