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(-3/4)*(16*x-12) = -21 // + 21
(-3/4)*(16*x-12)+21 = 0
21-3/4*(16*x-12) = 0
21-3/4*(16*x-12) = 0
30-12*x = 0
30-12*x = 0
30-12*x = 0 // - 30
-12*x = -30 // : -12
x = -30/(-12)
x = 5/2
x = 5/2
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