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Verified answer
7. ( 7x + 8) + ( 5x + 4 )= 7x+5x+8+4 = 180
= 12x + 12 = 180
=12x = 180-12
= 12x = 168
x = 168 : 12
x = 14
PQR = 7(14) +8
= 98 + 8 = 106 DERAJAT