Ответ:
- \(3x+2x=5x\), при \(x=0\): \(0\).
- \(7a-2a=5a\), при \(a=-\frac15\): \(-1\).
- \(28y-7y=21y\), при \(y=3\): \(63\).
- \(15+6x+2x=15+8x\), при \(x=-7\): \(-41\).
- \(45+27a-3a=45+24a\), при \(a=4\): \(141\).
- \(32+21y-8y=32+13y\), при \(y=-6\): \(-46\).
- \(11-(2x+x)=11-3x\), при \(x=2\): \(5\).
- \(4y+5y=9y\), при \(y=-0.1\): \(-0.9\).
- \(35x+4x=39x\), при \(x=4\): \(156\).
- \(32a+9a=41a\), при \(a=-7\): \(-287\).
- \(14+7y+3y=14+10y\), при \(y=5\): \(64\).
- \(27+12x-9x=27+3x\), при \(x=-4\): \(15\).
- \(39+15a-12=27+15a\), при \(a=2\): \(57\).
- \(7+(5y-3y)=7+2y\), при \(y=1\): \(9\).
- \((11x-6x)+4=5x+4\), при \(x=2\): \(14\).
