Ответ:
a) 7x-140=280
7x=280+140
7x=420
X=420:7
X=60
7•60-140=280
280=280
B)4x+120=360
4x=360-120
4x=240
X=240:4
4•60+120=360
360=360
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Ответ:
1.
a) 7x-140=280
7x=280+140
7x=420
X=420:7
X=60
7•60-140=280
280=280
B)4x+120=360
4x=360-120
4x=240
X=240:4
X=60
4•60+120=360
360=360