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(1/3)*x = -4/(-4) // + -4/(-4)
(1/3)*x-(-4/(-4)) = 0
(1/3)*x-1 = 0
1/3*x-1 = 0 // + 1
1/3*x = 1 // : 1/3
x = 1/1/3
x = 3
x = 3
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