7a-3b+2+7b
7-7a+2*4b-3c^3+3a*0^2+4c-b
3a^3 + 4aby -5a^3 + 9aby
1x - 2b + 7a - a + 5x - 4b
2a + -3b - 5b + -a
2c-5d+5ab+9c-6ab+7d
F/5 + 2 = 8
7a - 2a^2 + 5a^2 - 3
3b^2+ 7ab*2b + 7a^2+ a^2