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975/4-((30/8)*x) = 15 // - 15
975/4-((30/8)*x)-15 = 0
(-15/4)*x+975/4-15 = 0
915/4-15/4*x = 0 // - 915/4
-15/4*x = -915/4 // : -15/4
x = -915/4/(-15/4)
x = 61
x = 61
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