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7 = (1/4)*(7*x-4) // - (1/4)*(7*x-4)
7-((1/4)*(7*x-4)) = 0
(-1/4)*(7*x-4)+7 = 0
7-1/4*(7*x-4) = 0
7-1/4*(7*x-4) = 0
8-7/4*x = 0
8-7/4*x = 0
8-7/4*x = 0 // - 8
-7/4*x = -8 // : -7/4
x = -8/(-7/4)
x = 32/7
x = 32/7
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