(a1+a3)/2 = a2
(4x+5+7)/2 = x |*2
4x+5+7 = 2x
4x-2x = -5-7
2x = -12 /:2
x= -6
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(a1+a3)/2 = a2
(4x+5+7)/2 = x |*2
4x+5+7 = 2x
4x-2x = -5-7
2x = -12 /:2
x= -6
x-4x-5=7-x
-3x+x=7+5
-2x=12 //-2
x=-6