1) (x - 7) + x = 33;
x - 7 + x = 33;
x + x = 33 + 7;
2x = 40;
x = 40 : 2;
x = 20;
2) x + (x - 1) = 40;
x + x - 1 = 40;
2x = 41;
x = 20.5
1) (x - 7) + x = 33;
x - 7 + x = 33;
x + x = 33 + 7;
2x = 40;
x = 40 : 2;
x = 20;
2) x + (x - 1) = 40;
x + x - 1 = 40;
2x = 41;
x = 20.5