解方程:180-x=270-3x

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解方程:180-x=270-3x解方程:180-x=270-3x解方程:180-x=270-3x180-x=270-3x3x-x=270-1802x=90x=90/2x=45454575454545移

解方程:180-x=270-3x
解方程:180-x=270-3x

解方程:180-x=270-3x
180-x=270-3x
3x-x=270-180
2x=90
x=90/2
x=45

45

45

75

45

45

45

移项得,-x+3x=270-180
合并同类项得,2x=90
x=45