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x=70-15
x=55
b)2x=87
x=87:2
x=43,5
c)x:3=12
x=12*3
x=36
d)x+5=(x+1)*2
x+5=2x+2
x+5-2=2x
x+3=2x
3=2x-x
3=x
Jak coś to pisz na pw. :)
x=55
b)2x=87
x=43,5
c)x= 12*3
x= 36
d) x= 2x + 2 - 5
-x= -3
x=3 :)
x=70-15
x=55
2x=87
x=87:2
x=43,5
x:3=12
x=12x3
x=36
a tego ostatniego nie wiem.
alexandra1212