exam Maths Puzzle Numerical Ability

Please help me solve for a,b,c, and d

a+b+c+d=8
a+b+c+2d=7
a+b+2c+3d=3
a+2b+3c+4d=4

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exam Other Question

factor each trinomial. Factor out all common monomials first including -1 if the lead coefficient is negative if a trinomial is prime, so indicate
a^4-13a^2+36 3/x + 4/5x2-7/25x