exam Maths Puzzle Numerical Ability

how do you solve 2x+25=12

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exam Other Question

Given f(x) = 2x + 5, find f(a - 1).
These are my choices
2a + 3
2a + 4
a + 6
a + 3 Mutiply and simplify:

(4-3 square root 2) (5+2 square root 2)