bsr
-1/2+3=x-7
= -x+6=2x-14
= -x-2x= -14-6
= -3x= -20
x= 20/3
3/2x+4=2x-5
= 3x+8=4x-10
= 3x-4x= -10-8
= -x-18
x= 18
voilà
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bsr
-1/2+3=x-7
= -x+6=2x-14
= -x-2x= -14-6
= -3x= -20
x= 20/3
3/2x+4=2x-5
= 3x+8=4x-10
= 3x-4x= -10-8
= -x-18
x= 18
voilà