Даю 40 баллов, реши 4 примера!
Найдите корень уравнения
1) (7x+1)-(9x+3)=5
2) 3,4+2y=7(y-2,3)
3) 0,2(7-2y)=2,3-0,3(y-6)
4) 2/3(1/3x-1/2)=4x+2 1/2.

1) (7x+1)-(9x+3)=57x + 1 - 9x - 3 = 5-2x - 2 = 5-2x = 5 + 2-2x = 7x = -7 : 2x = -3,52) 3,4+2y=7(y-2,3)3,4 + 2y = 7y - 16,12y - 7y = -16,1 - 3,4-5y = -19,5y = 19,5 : 5y = 3,93) 0,2(7-2y)=2,3-0,3(y-6)1,4 - 0,4y = 2,3 - 0,3y + 1,81,4 - 0,4y = 4,1 - 0,3y-0,4y + 0,3y = 4,1 - 1,4-0,1y = 2,7y = -2,7 : 0,1y = -274) 2/3(1/3x-1/2)=4x+2 1/2.2/9x - 1/3 = 4x + 5/22/9x - 4x = 5/2 + 1/3-3 7/9x = 15/6 + 2/6-34/9x = 17/6x = -17/6 * 9/34x = -3/4