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HELP ME! 3×(56-a)+(a-56):1+17×3+27:3=60 Aflați pe a va rog!

Răspuns :

3•a+a:1+17•3+27:3=60
3•56-a+a-56:1+51+9=60
168-a+a-56+60=60
168-2a-116=60
168-2a=116+60
168-2a=176
2a=176+168
2a=344
a=344:2
a=172