解方程.4x=42(x+2) 4x=4.3(x-9)

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解方程.4x=42(x+2) 4x=4.3(x-9)

解方程.4x=42(x+2) 4x=4.3(x-9)
解方程.4x=42(x+2) 4x=4.3(x-9)

解方程.4x=42(x+2) 4x=4.3(x-9)
4x=42x+84
4x-42x=84
-38x=84
x=-42/19
4x=4.3x-38.7
4-4.3x=-38.7
0.3x=38.7
x=129
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4x=42x+84,-84=38x,x=-84/38=-42/19;
4x=4.3x-38.7,38.7=0.3x,x=12.9

4x=42(x+2)
4x=42x+84
4x-42x=84
-38x=84
x=-19/42
2) 4x=4.3(x-9)
4x=4.3x-4.3x9
-0.3=-38.7
x=129

1. 4x=42x+84, -84=38x, x=-84/38 X=-42/19;
2. 4x=4.3x-38.7, 38.7=0.3x,x=38.7/0.3 X=129