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4 = (7/10)*x // - (7/10)*x
4-((7/10)*x) = 0
(-7/10)*x+4 = 0
4-7/10*x = 0 // - 4
-7/10*x = -4 // : -7/10
x = -4/(-7/10)
x = 40/7
x = 40/7
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