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5*x-(30/7) = -2*x // + -2*x
5*x-(-2*x)-(30/7) = 0
5*x+2*x-30/7 = 0
7*x-30/7 = 0 // + 30/7
7*x = 30/7 // : 7
x = 30/7/7
x = 30/49
x = 30/49
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