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2x=16/:2
x=8
b)4x+2x+7x=5+4+31
13x=40/:13
x= 3,07
c)2x-6+12-3x=5
2x-3x=5+6-12
-x=-1
x=1
d)3x-12-4x+10=-4
3x-4x=-4+12-10
-x=-2
x=2
e)2x+8-5x-15=2
2x-5x=2-8+15
-3x=9/:(-3)
x=-3