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Answer:
4*5x-7=20
4*5(-7)-7=20
20(-7)-7=20
-140-7=20
-140=20+7
-140=27
=27+140
=167
-3x+7=28
-3(6)+7=28
-3(6)=28-7
-18=21
=21+18
=39
2x+3=-7
2(-5)+3=-7
2(-5)=-7-3
-10=-10
=-10+10
=0
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