book Maths Puzzle Numerical Ability

7x + 5y = 13
3y - x = -13

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book Other Question

the measure of the second angle of a triangle is 21 degrees more than the measure of the first angle. The measure of the thirs angle is 15 degrees less than the measure of the firs (x-1)(x+2)(2x-3)(3x-6)(x+1)=0
the no of possible values of x that are integer