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(15x+20y+33)+(-24x+17y-45)
= 15x-24x +20y+17y +33-45
= -9x +37y-12
semoga membantu :-)
=15x+20y+33-24x+17y-45
=15x-24x +20y+17y +33-45
= -9x+37y-12