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(4x+5x+6x)+(10-30-40)=15x-60=180
15x=180+60=240
x=240/15=16
a) 4x+10=4.16+10=74
b)5x-30=5.16-30=80-30=50
c)6x-40=6.16-40=96-40=56
sisi terpanjang yg bagian a)
jadikan jawaban terbaik yaa