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х+х+86=128

2 х+5 х+49=287

(х+20) * 10=700

8 * (36+х) = 1288

(х-65) * 5=400

(х-84) * 11=176

Х+х+86=128

2 х+5 х+49=287

7x + 49 = 287

7x = 287 - 49

7x = 238

x = 238/7

x = 34

(х+20) * 10=700

x + 20 = 70

x = 70-20

x = 50

8 * (36+х) = 1288

36 + x = 161

x = 161 - 36

x = 125

(х-65) * 5=400

x - 65 = 80

x = 80 + 65

x = 145

(х-84) * 11=176

x - 84 = 16

x = 16 + 84

x = 100