76x = 38 · 50
76x = 1900
x = 1900 ÷ 76
x = 25
12(x + 9x) = 480
x + 9x = 480 ÷ 12
10x = 40
x = 40 ÷ 10
x = 4
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76x = 38 · 50
76x = 1900
x = 1900 ÷ 76
x = 25
12(x + 9x) = 480
x + 9x = 480 ÷ 12
10x = 40
x = 40 ÷ 10
x = 4