7.8x+x-4.9=21.5(用方程解)

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7.8x+x-4.9=21.5(用方程解)
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7.8x+x-4.9=21.5(用方程解)
7.8x+x-4.9=21.5(用方程解)

7.8x+x-4.9=21.5(用方程解)
7.8x+x-4.9=21.5
8.8x=26.4;
x=3;

7.8x+x-4.9=21.5
8.8x=26.4
x=3

8.8x-4.9=21.5
8.8x=26.4
x=26.4/8.8=3

移项:7.8x+x=21.5+4.9
8.8x=26.4
x=3

8.8x=21.5+4.9
x=3

7.8 x + x - 4.9 = 21.5
7.8 x + x - 4.9 = 21.5
8.8 x - 4.9 = 21.5
8.8 x = 21.5 + 4.9
8.8 x = 26.4
x = 26.4 ÷ 8.8
x = 3