Răspuns:
a ) - 3 ; b ) - 15 ; c ) 8
Explicație pas cu pas:
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a ) 5 · x + 4 - 3 = - 14
5x + 1 = - 14
5x = - 14 - 1
5x = - 15
x = ( - 15 ) : 5
x = - 3
b ) 5 · ( x + 3 ) = 3 · ( x - 5 )
5x + 15 = 3x - 15
5x - 3x = - 15 - 15
2x = - 30
x = ( - 30 ) : 2
x = - 15
c ) 2 · ( x + 6 ) - ( x + 2 ) = 18
2x + 12 - x - 2 = 18
x + 10 = 18
x = 18 - 10
x = 8
