G91
&D

G01 X&E20. Y&E20.

G00 X&D15.0

G01 X20.0 F100
G01 X&D20.0 F150
G01 X45.0

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L X+20.0 F100
L IX+20.0 F150
L X+45.0

#105 = 102
#100 = #105
G01 X#100 F100 // LINEAR INTERPOLATION TO X102.

G01 X102.0 F100 // LINEAR INTERPOLATION TO X102.

#102 = 2
#103 = 3
G00 Y&A(#102*#103)