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5*x-(30/8) = -2*x // + -2*x
5*x-(-2*x)-(30/8) = 0
5*x+2*x-15/4 = 0
7*x-15/4 = 0 // + 15/4
7*x = 15/4 // : 7
x = 15/4/7
x = 15/28
x = 15/28
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