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a+2=6x2-4

85-b=3x2+4

x-15=36-6x2

7+y=15+3x9




Răspuns :

a+2=8
a=8-2
a=6

85-b=10
-b=10-85
-b=-75
b=75

x-15=24
x=24+15
x=39

7+x=42
x=42-7
x=35