Răspuns :
a - 3750+3500-375+890=7000
a-3750+3500-375=7000-890
=6110
a-3750+3500=6110+375
=6485
a-3750=6485-3500
a-3750=2985
a=2985+3750
a=6.735
x-3750+3500-375+890=7000
x-3750+3500-375=7000-890
x-3750+3500-375=6110
x-3750+3500=6100+375
x-3750+3500=6485
x-3750=6485-3500
x-3750=2985
x=2985+3750
x=6735
x-3750+3500-375=7000-890
x-3750+3500-375=6110
x-3750+3500=6100+375
x-3750+3500=6485
x-3750=6485-3500
x-3750=2985
x=2985+3750
x=6735