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6x+3=8 /-3
6x=5 /:6
x= 5/6
15+3x-7x=5
15-4x=5 /-15
-4x=-10 /-4
x= 2,5
6-2x=4 /-6
-2x=-2 /:-2
x=1
2x:7=10
2/7x=10 /*7
2x=70 /:2
x=35