book Maths Puzzle Numerical Ability

how can you solve an equations with one variable and two numbers if they have a neggative and positive sign.

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book Other Question

Divide

x^2 - 2x - 35 divided by x + 5
The question is :
Phyllis invested $12,000, part at 14% annual interest and the remainder at 10%. Last year she earned $1,632 in interest. How much money did she invest at each