-0,6(16b-5)-(2,9b-8)-4(4-1.5b)= -9,6b+3-2.9b+8-16+6b=-6.5b-5
b=-9/13
-6,5*(-9/13)-5=-1/2=-0.5
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-0,6(16b-5)-(2,9b-8)-4(4-1.5b)= -9,6b+3-2.9b+8-16+6b=-6.5b-5
b=-9/13
-6,5*(-9/13)-5=-1/2=-0.5