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7x=15+6
x7=21/:7
x=3
spr
3*7-6=15
21-6=15
15=15
L=P
4*x+12=32
4x=32-12
4x=20/:4
x=5
spr
4*5+12=32
20+12=32
32=32
L=P
x/3+5=14 /*3
x+15=42
x=42-15
x= 27
spr 27:3+5=14
9+5=14
14=14
L=P