x-27+15=53
x-27=53-15
x-27=38
x=38+27
x=65
x-35=43-14
x-35=29
x=29+35
x=64
x-27+15=53
<=> x-27=53-15
<=>x-27=38
<=>x=38+27
<=>65
x-35=43-14
<=>x-35=29
<=>x=29+35
<=>x=64
x-27+15=53 x-35=43-14
(=)x-27=53-15 (=)x-35=29
(=)x-27=38 (=)x=29+35
(=)x=38+27 (=)x=64
(=)x=65