book Maths Puzzle Numerical Ability

Wut does ( ) that mean in an order of an operation problem?

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please help me solve this equation
Give a reason for each step in the proof.
given: m<1 and m<2 are a linear pair.m<1=130 degrees
Prove:m<2=50 dergees
Proof:
1.m<1=130 degree Sum the polynomials 2x^2 - 3x - 4, 2x - 5 and 3x^3 + 2x^2 - 6.