I need help solving this
Here is what I see looking at this problem: the equal sign makes this an equation. There is one variable, x.
Those two observations lead me to think we can solve for a value of x.
The trick here is to apply the order of operations to expand the terms in parentheses. The parentheses here mean multiplication. Distribute the 3 over the x and the 5:
3*x+3*5+4(x-4)=13 I'm using * for multiplication.
Do the same with 4:
Now combine the like terms. Terms that contain x are alike. So are the numerical terms.
We want to isolate the x, so we use the trick that you can add or subtract anything to the equation as long as you do it to both sides. Add 1 to each side:
Now the last step. You can divide one side of the equation by almost any number, as long as you do the same thing to the other side. I say almost any number, because the one number you can't divide by is zero.
Divide both sides by 7:
And that's it.
You can check this by plugging 2 into the original equation for x and seeing if it works: