=
Means Copy or Calculate
Equal sign "=" usually means copy something:
/add 5 = inclfile {copy "inclfile" into your file}
/add 5 = 10/20 {copy lines 10/20 after line 5}
/text w2 = w1 {build "w2" and copy "w1" into it}
Equal sign at the start of a command means to calculate something:
=10+25 {evaluate the expression}
Result= 35.0