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70 = 2*((7*10*x)/4) // - 2*((7*10*x)/4)
70-(2*((7*10*x)/4)) = 0
70-35*x = 0
70-35*x = 0 // - 70
-35*x = -70 // : -35
x = -70/(-35)
x = 2
x = 2
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