formula: Fie numerele a,b,c termeni ai unei p.a atunci 2b = a+c
2(x+2) = x-4+2x+2
2x+4 = 3x-2
2x-3x = -2-4
-x = -6
x = 6
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formula: Fie numerele a,b,c termeni ai unei p.a atunci 2b = a+c
2(x+2) = x-4+2x+2
2x+4 = 3x-2
2x-3x = -2-4
-x = -6
x = 6