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4x-7=17 /-7
4x=17 /:4
x=4,25
b)
8,5+3y= -5,3 /-8,5
3y= 13,8 /:3
y=4,6
c)
8x-6=4x+14 /-4x
4x-6=14 /+6
4x=20 /:4
x=5