1.5a+2a=7a
2.6b-4b=2b
3.2x+7x-5x=4x
4.3y-y-4y+8y=6y
5.4a-5b-2a-3b=2a-8b
6.7x²-6x-5x²+3x=2x²+3x
7.6x+5-8y-3+5y-4x=2x+2-3y
8.5ab-4a+6b+8a-2b+3ab=8ab+4a+4b
9.6a+7b-5c-4b+2a+c-5b-6a+2c=2a-2b-2c
10.5m-9+3n-7m+4n+4-5n-3m=-5m-5-2n
11.8-7a-6ab+5b+10a+4ab-4a-11b-3=5+13a-2ab-6b
12.4x-6y-8+3z-11x-7z+5y-2+16x=9x-y-10-4z
13.3y²-5y-8y²+12y+6y²-7y=y²
14.4a⁵+6a³-a⁵-2a³+3a⁵=6a⁵+4a³
15.10a²+7ab-4²+3b²-6ab-6a²-4ab-5b²=4a²-3ab-16-2b²
16.8x³y²-5x²y³+2x²y³-6x³y²=2x³y²-3x³y²
17.3ab⁵+2a³-5b²+4a³-3b²-6ab⁵=-3ab⁵+6a³-8b²
18.7m⁵n⁴-5n³+3m²+10n³-6m²-2m⁵n⁴=5m⁵n⁴+5n³-3m²
19.a³-4a²+6-3a³-2a²-10+5a³+3a²+4=3a³-3a²
20.5c²-4c³-9+3c+3c³-2c²+6+c³-4c=3c²-3-c
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