Помагите все уравнения даю 30 балов
1. 50-11•х = 28 -11х = 28-50 -11х = 22 х = 2 2. х+50•100 = 700 50х+100 = 700 50х = 700-100 50х = 600 х = 12 3. 87-х:4 = 68 87-1/4х=68 348-х=272 -х = 272-348 -х = -76 х = 76 4. 36+х•2=50 36+2х=50 2х = 50-35 2х = 14 х = 7