Wykonaj równania:
a) 5x - 4 : 2 = x : 3 - 2 + 2/frac {1}{2}
b) 40x - 12 : 4 = 30x - 9 : 3
c) 5x - 6( x+7 ) = 8x - 9( 10+x )
d) x + 4 : 2 -5 = -3
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