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4-((3*x)/5)-(7*x) = 7/12 // - 7/12
4-((3*x)/5)-(7*x)-(7/12) = 0
(-3/5)*x-7*x-7/12+4 = 0
41/12-38/5*x = 0 // - 41/12
-38/5*x = -41/12 // : -38/5
x = -41/12/(-38/5)
x = 205/456
x = 205/456
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