Higher Vocational Mathematics —— arithmetic progression's General Formula for Solving Equations

The first equation:

(a-d)+a+(a+d)= 120

∴3a= 120

∴a=40 and 4(a-d)+5=a+d:

4(40-d)+5=40+d

∴ 160-d+5=40+d

∴d=25

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