exam Maths Puzzle Numerical Ability

solve:

3a^3-42a^2+147a=2a-14

choices:
1) +7, -7
2) +7 only
3) -7 only
4) none of these

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exam Other Question

Cindy gets a paycheck. She repays her brother $10 she owes him and spends $30 on gas. She then spends half of the remaining money on a tent. She buys a pair of shoes for $29.45 and has $17.75 left.

What was the amount of her paycheck? Two cars start toward each other at the same time from two cities 382.5 km apart. If one car averages 40 km/hr and the other 45 km/hr, How much time will elapse before they meet