2*(x-4)+18=20
2x-8+18=20
2x=20+8-18
2x=10
x=10:2
x=5
Ответ: x=5
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2*(x-4)+18=20
2x-8+18=20
2x=20+8-18
2x=10
x=10:2
x=5
Ответ: x=5