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5*x-((15/7)*x)+4*21*x+(12/14)*x-42 = 0
5*x+(-15/7)*x+4*21*x+(12/14)*x-42 = 0
614/7*x-42 = 0 // + 42
614/7*x = 42 // : 614/7
x = 42/614/7
x = 147/307
x = 147/307
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