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4x-7=17
4x=17+7
4x=24 /:4
x=6
b)
8,5+3y=-5,3
3y=-5,3-8,5
3y=-13,8 /:3
y=-4,6
c)
8x-6=4x+14
8x-4x=14+6
4x=20 /:4
x=5