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7x=2 /:7
x=2/7
b)4-x=1,3 /-4
-x=-2.7 /*(-1)
x=2.7
c) -x-x-3=-4
-2x-3=-4 /+3
-2x=-1 /:(-2)
x=1/2
d)2x+2=4 /-2
2x=2 /:2
x=1