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3x+20+4x-36=180 linear pair
7x+(-16)=180
7x=180+16
7x=196
x=196÷7
x=28
so there fore x=28
so putting value of X
1.3(28)+20
84+20=104
2.4(28)-36
112-36= 76
THEREFORE 104+76=180
3.VALUE OF X IS 28
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