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...!
\(\left(5+8\div \:4\times \:3\right)\times \:2-7\)
\(x=11\times \:2-7\)
\(=22-7\)
\(=15\)