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(-4/9)*x+1/2 = -7 // + 7
(-4/9)*x+1/2+7 = 0
15/2-4/9*x = 0 // - 15/2
-4/9*x = -15/2 // : -4/9
x = -15/2/(-4/9)
x = 135/8
x = 135/8
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