(5+8÷4×3)2−7

Use the order of operations:

PEMDAS

P - Parentheses

E - Exponents

M - Multiplication

D - Division

A - Addition

S - Subtraction

2(5 + 8/4 * 3) - 7

2(5 + 2 * 3) - 7

2(5 + 6) - 7

2(11) - 7

22 - 7

15

Great job CubeyThePenguin...!

$​​​​​\left(5+8\div \:4\times \:3\right)\times \:2-7$

$x=11\times \:2-7$

$=22-7$

$=15$