10×а = 15×4 (Х+8) ÷ 70 =4
1)10a=60 a=60:10 a=6 2)(x+8):70=4 x+8=280 x=280-8 x=272
10xa=15x4 10xa=60 a=60:10 a=6 (X+8)/70=4 X+8=70x4 X+8=280 X=280-8 X=272