a) x -2143=1341
x = 1341 + 2143
x = 3484
b) x-2146=4146
x = 4146+2146
x =6292
c) x+528 = 1322 + 249
x + 528=1571
x =1571-528
x =1043
d) x -3145=3915
x =3915+3145
x =7060
X-2143=1341
= 1341+2143
=3484.
X-2146=4146
=4146+2146
= 6292
X+528=1322+249
=1322+249
=1571-528
= 1043
X-3145=3915
=3915 +3145
= 7060.