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(1/4)*x = 21-((1/3)*x) // - 21-((1/3)*x)
(1/4)*x+(1/3)*x-21 = 0
7/12*x-21 = 0 // + 21
7/12*x = 21 // : 7/12
x = 21/7/12
x = 36
x = 36
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