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x = 7-5
x = 2
b. x+(-3) = 0
x-3=0
x = 3
c. -x+2 = 5
-x = 5-2
-x = 3 ==> - nya pindah posisi
x = -3
d. -x+(-5) = -6
-x-5 = -6
-x = -6+5
-x = -1
x = 1