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(2*x)/5-((3*a)/4)+3 = -21/6 // + -21/6
(2*x)/5-((3*a)/4)-(-21/6)+3 = 0
(-3/4)*a+(2*x)/5+7/2+3 = 0
2/5*x-3/4*a+13/2 = 0 // - 13/2-3/4*a
2/5*x = -(13/2-3/4*a) // : 2/5
x = (-(13/2-3/4*a))/2/5
x = -5/2*(13/2-3/4*a)
x = -5/2*(13/2-3/4*a)
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