解:解方程, 此方程的解为x = 19/9
∵A + B = C,即A = C - B
7A - 2A = 5A
∴7x - 5 + 2x = 14
7x + 2x - 5 = 14
9x = 14 + 5
9x = 19
x = 19 ÷ 9
x = 19 × 1/9
∴x = 19/9
答:此方程的解为x = 19/9
七,x-5.2,加五点二等于14
7x-5+2x=14
7x+2x=14+5
9x=19
x=19/9
请理解以上解答