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2x+6=14
2x=14-6
2x=8 /:2
x=4
B) 2(x-7)=3x+1
2x-14=3x+1
2x-3x=1+14
-1x=15 /*(-1)
x=-15
C) -5-(2x-4)=21
-5-2x+4=21
-2x=21+5-4
-2x=22 /:
x=-11
D) 0,2x+3=7
E) 1/2x+1/4=2
F) x/2+1/3=x/3
G) 0.75(4x+8)=8
H) -(3x+15)=10
I) 7(x+1)-(3x+2)=0