Cerinta :
b)(3x + 7) - (4 - 2x) - (5x - 2) = 3x+7-4+2x–5x+2 = 5
Acest exercitiu se poate scrie si asa :
( 3 x X + 7 ) - ( 4 - 2 x X ) - ( 5 x X - 2 ) = 5
Raspuns :
( 3 x X + 7 ) - ( 4 - 2 x X ) - ( 5 x X ) = 7 ( 5 + 2 )
( 3 x X + 7 ) - ( 2 x X ) - ( 5 x X ) = 11 ( 7 + 4 )
( 3 x X ) - ( 2 x X ) - ( 5 x X ) = 18 ( 11 + 7 )
Tot adunat : 3 + 2 + 5 = 10
10 x X = 18
X = 18 : 10
X = 1, rest 8