Question

solve 2a-2d=0
2a+5d=14

answer is given d=2
a=2
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Answer 1

2a-2d=0
2a+5d=14

(simultaneous equation)

2a-2d=0
2a+5d=14
(-)  (-)  (-)
0   -7d=-14
      d=2

2a-2*2=0 ......(plugging in d into the equation)
2a-4=0
2a=4
a=2
hope it helps!!!
this is simaltaneous equations.....so you have to learn it or search it up in the net.