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3x-7=11
3x=11+7
3x=18 /:3
x=6
b)
5(3x-1)=-2(x-6)
15-5=-2x+12
10=-2x+12
10-12=-2x
-2=-2x /:(-2)
1=x
c)
+3=2 /*(-4)
x-12=-8
x=-8+12
x=4
d)
2x+=7 /*3
6x+5=21
6x=21-5
6x=16 /:6
x=2
3x=11+7
3x=18/3
x=6
b) 5 (3x-1)=-2(x-6)
15x-5=(-2x)+12
15x+2x=12+5
17x=17/17
x=1